diff --git a/web/html/xui/xray.html b/web/html/xui/xray.html
index e8f2830a..ef1f48dd 100644
--- a/web/html/xui/xray.html
+++ b/web/html/xui/xray.html
@@ -104,8 +104,8 @@
                             </a-col>
                         </a-row>
                     </a-card>
-                    <a-tabs default-active-key="1" @change="(activeKey) => { if(activeKey == 'tpl-advanced') this.changeCode(); }">
-                        <a-tab-pane key="tpl-1" tab='{{ i18n "pages.xray.basicTemplate"}}' style="padding-top: 20px;">
+                    <a-tabs default-active-key="1" @change="(activeKey) => { this.changePage(activeKey); }">
+                        <a-tab-pane key="tpl-basic" tab='{{ i18n "pages.xray.basicTemplate"}}' style="padding-top: 20px;">
                             <a-collapse>
                                 <a-collapse-panel header='{{ i18n "pages.xray.generalConfigs"}}'>
                                     <a-row :xs="24" :sm="24" :lg="12">
@@ -279,9 +279,7 @@
                                 </a-collapse-panel>
                             </a-collapse>
                         </a-tab-pane>
-                        <a-tab-pane key="tpl-2" tab='{{ i18n "pages.xray.Routings"}}' style="padding-top: 20px;">
-                            <a-alert type="warning" style="margin-bottom: 10px; width: fit-content"
-                            message='{{ i18n "pages.xray.RoutingsDesc"}}' show-icon></a-alert>
+                        <a-tab-pane key="tpl-routing" tab='{{ i18n "pages.xray.Routings"}}' style="padding-top: 20px;">
                             <a-button type="primary" icon="plus" @click="addRule">{{ i18n "pages.xray.rules.add" }}</a-button>
                             <a-table :columns="isMobile ? rulesMobileColumns : rulesColumns" bordered
                                 :row-key="r => r.key"
@@ -399,7 +397,7 @@
                                 </template>
                             </a-table>
                         </a-tab-pane>
-                        <a-tab-pane key="tpl-3" tab='{{ i18n "pages.xray.Outbounds"}}' style="padding-top: 20px;" force-render="true">
+                        <a-tab-pane key="tpl-outbound" tab='{{ i18n "pages.xray.Outbounds"}}' style="padding-top: 20px;" force-render="true">
                             <a-button type="primary" icon="plus" @click="addOutbound()" style="margin-bottom: 10px;">{{ i18n "pages.xray.outbound.addOutbound" }}</a-button>
                             <a-button type="primary" icon="cloud" @click="showWarp()" style="margin-bottom: 10px;">WARP</a-button>
                             <a-table :columns="outboundColumns" bordered
@@ -443,7 +441,7 @@
                                 </template>
                             </a-table>
                         </a-tab-pane>
-                        <a-tab-pane key="tpl-4" tab='{{ i18n "pages.xray.outbound.reverse"}}' style="padding-top: 20px;" force-render="true">
+                        <a-tab-pane key="tpl-reverse" tab='{{ i18n "pages.xray.outbound.reverse"}}' style="padding-top: 20px;" force-render="true">
                             <a-button type="primary" icon="plus" @click="addReverse()" style="margin-bottom: 10px;">{{ i18n "pages.xray.outbound.addReverse" }}</a-button>
                             <a-table :columns="reverseColumns" bordered v-if="reverseData.length>0"
                             :row-key="r => r.key"
@@ -471,9 +469,7 @@
                                 </template>
                             </a-table>
                         </a-tab-pane>
-                        <a-tab-pane key="tpl-5" tab='{{ i18n "pages.xray.Balancers"}}' style="padding-top: 20px;" force-render="true">
-                            <a-alert type="warning" style="margin-bottom: 10px; width: fit-content"
-                            message='{{ i18n "pages.xray.balancer.balancerDesc" }}' show-icon></a-alert>
+                        <a-tab-pane key="tpl-balancer" tab='{{ i18n "pages.xray.Balancers"}}' style="padding-top: 20px;" force-render="true">
                             <a-button type="primary" icon="plus" @click="addBalancer()" style="margin-bottom: 10px;">{{ i18n "pages.xray.balancer.addBalancer"}}</a-button>
                             <a-table :columns="balancerColumns" bordered v-if="balancersData.length>0"
                             :row-key="r => r.key"
@@ -500,15 +496,28 @@
                                     </a-dropdown>
                                 </template>
                                 <template slot="strategy" slot-scope="text, balancer, index">
-                                    <a-tag style="margin:0;" v-if="balancer.strategy=='random'" color="purple">Random</a-tag>
-                                    <a-tag style="margin:0;" v-if="balancer.strategy=='roundRobin'" color="green">Round Robin</a-tag>
+                                    <a-tag style="margin:0;" v-if="balancer.strategy=='random'" color="blue">Random</a-tag>
+                                    <a-tag style="margin:0;" v-if="balancer.strategy=='roundRobin'" color="blue">Round Robin</a-tag>
+                                    <a-tag style="margin:0;" v-if="balancer.strategy=='leastPing'" color="green">Least Ping</a-tag>
+                                    <a-tag style="margin:0;" v-if="balancer.strategy=='leastLoad'" color="purple">Least Load</a-tag>
                                 </template>
                                 <template slot="selector" slot-scope="text, balancer, index">
                                     <a-tag class="info-large-tag" style="margin:1;" v-for="sel in balancer.selector">[[ sel ]]</a-tag>
                                 </template>
-                            </a-table>                            
+                            </a-table>
+                            <a-radio-group
+                                v-model="obsSettings"
+                                v-if="observatoryEnable || burstObservatoryEnable"
+                                @change="changeObsCode"
+                                button-style="solid"
+                                style="margin: 10px 0;"
+                                :size="isMobile ? 'small' : ''">
+                                <a-radio-button value="observatory" v-if="observatoryEnable">Observatory</a-radio-button>
+                                <a-radio-button value="burstObservatory" v-if="burstObservatoryEnable">Burst Observatory</a-radio-button>
+                            </a-radio-group>
+                            <textarea style="position:absolute; left: -800px;" id="obsSetting"></textarea>
                         </a-tab-pane>
-                        <a-tab-pane key="tpl-6" tab='DNS' style="padding-top: 20px;" force-render="true">
+                        <a-tab-pane key="tpl-dns" tab='DNS' style="padding-top: 20px;" force-render="true">
                             <setting-list-item type="switch" title='{{ i18n "pages.xray.dns.enable" }}' desc='{{ i18n "pages.xray.dns.enableDesc" }}' v-model="enableDNS"></setting-list-item>
                             <template v-if="enableDNS">
                                 <setting-list-item type="text" title='{{ i18n "pages.xray.dns.tag" }}' desc='{{ i18n "pages.xray.dns.tagDesc" }}' v-model="dnsTag"></setting-list-item>
@@ -695,6 +704,7 @@
             showAlert: false,
             isMobile: window.innerWidth <= 768,
             advSettings: 'xraySetting',
+            obsSettings: '',
             cm: null,
             cmOptions: {
                 lineNumbers: true,
@@ -772,6 +782,22 @@
                     ],
                     "queryStrategy": "UseIP"
                 },
+            },
+            defaultObservatory: {
+                subjectSelector: [],
+                probeURL: "http://www.google.com/gen_204",
+                probeInterval: "10m",
+                enableConcurrency: true
+            },
+            defaultBurstObservatory: {
+                subjectSelector: [],
+                pingConfig: {
+                    destination: "http://www.google.com/gen_204",
+                    interval: "30m",
+                    connectivity: "http://connectivitycheck.platform.hicloud.com/generate_204",
+                    timeout: "10s",
+                    sampling: 2
+                }
             }
         },
         methods: {
@@ -824,6 +850,10 @@
                     this.saveBtnDisable = true;
                 }
             },
+            changePage(pageKey) {
+                if(pageKey == 'tpl-advanced') this.changeCode();
+                if(pageKey == 'tpl-balancer') this.changeObsCode();
+            },
             syncRulesWithOutbound(tag, setting) {
                 const newTemplateSettings = this.templateSettings;
                 const haveRules = newTemplateSettings.routing.rules.some((r) => r?.outboundTag === tag);
@@ -906,6 +936,23 @@
                     }
                 });
             },
+            changeObsCode() {
+                if (this.obsSettings == ''){
+                    return
+                }
+                if(this.cm != null) {
+                    this.cm.toTextArea();
+                }
+                textAreaObj = document.getElementById('obsSetting');
+                textAreaObj.value = this[this.obsSettings];
+                this.cm = CodeMirror.fromTextArea(textAreaObj, this.cmOptions);
+                this.cm.on('change',editor => {
+                    value = editor.getValue();
+                    if(this.isJsonString(value)){
+                        this[this.obsSettings] = value;
+                    }
+                });
+            },
             isJsonString(str) {
                 try {
                     JSON.parse(str);
@@ -1081,14 +1128,27 @@
                             'tag': balancer.tag,
                             'selector': balancer.selector
                         };
-                        if (balancer.strategy == 'roundRobin') {
+                        if (balancer.strategy && balancer.strategy != 'random') {
                             tmpBalancer.strategy = {
                                 'type': balancer.strategy
                             };
+                            if (balancer.strategy == 'leastPing'){
+                                if (!newTemplateSettings.observatory)
+                                    newTemplateSettings.observatory = this.defaultObservatory;
+                                if (!newTemplateSettings.observatory.subjectSelector.includes(balancer.tag))
+                                    newTemplateSettings.observatory.subjectSelector.push(balancer.tag);
+                            }
+                            if (balancer.strategy == 'leastLoad'){
+                                if (!newTemplateSettings.burstObservatory)
+                                    newTemplateSettings.burstObservatory = this.defaultBurstObservatory;
+                                if (!newTemplateSettings.burstObservatory.subjectSelector.includes(balancer.tag))
+                                    newTemplateSettings.burstObservatory.subjectSelector.push(balancer.tag);
+                            }
                         }
                         newTemplateSettings.routing.balancers.push(tmpBalancer);
                         this.templateSettings = newTemplateSettings;
                         balancerModal.close();
+                        this.changeObsCode();
                     },
                     isEdit: false
                 });
@@ -1108,10 +1168,31 @@
                             'tag': balancer.tag,
                             'selector': balancer.selector
                         };
-                        if (balancer.strategy == 'roundRobin') {
+
+                        // Remove old tag
+                        if (newTemplateSettings.observatory){
+                            newTemplateSettings.observatory.subjectSelector = newTemplateSettings.observatory.subjectSelector.filter(s => s != oldTag);
+                        }
+                        if (newTemplateSettings.burstObservatory){
+                            newTemplateSettings.burstObservatory.subjectSelector = newTemplateSettings.burstObservatory.subjectSelector.filter(s => s != oldTag);
+                        }
+
+                        if (balancer.strategy && balancer.strategy != 'random') {
                             tmpBalancer.strategy = {
                                 'type': balancer.strategy
                             };
+                            if (balancer.strategy == 'leastPing'){
+                                if (!newTemplateSettings.observatory)
+                                    newTemplateSettings.observatory = this.defaultObservatory;
+                                if (!newTemplateSettings.observatory.subjectSelector.includes(balancer.tag))
+                                    newTemplateSettings.observatory.subjectSelector.push(balancer.tag);
+                            }
+                            if (balancer.strategy == 'leastLoad'){
+                                if (!newTemplateSettings.burstObservatory)
+                                    newTemplateSettings.burstObservatory = this.defaultBurstObservatory;
+                                if (!newTemplateSettings.burstObservatory.subjectSelector.includes(balancer.tag))
+                                    newTemplateSettings.burstObservatory.subjectSelector.push(balancer.tag);
+                            }
                         }
 
                         newTemplateSettings.routing.balancers[index] = tmpBalancer;
@@ -1125,6 +1206,7 @@
                         }
                         this.templateSettings = newTemplateSettings;
                         balancerModal.close();
+                        this.changeObsCode();
                     },
                     isEdit: true
                 });
@@ -1139,11 +1221,20 @@
                 let realIndex = newTemplateSettings.routing.balancers.findIndex((b) => b.tag === removedBalancer.tag);
                 newTemplateSettings.routing.balancers.splice(realIndex, 1);
 
+                // Remove tag from observatory
+                if (newTemplateSettings.observatory){
+                    newTemplateSettings.observatory.subjectSelector = newTemplateSettings.observatory.subjectSelector.filter(s => s != removedBalancer.tag);
+                }
+                if (newTemplateSettings.burstObservatory){
+                    newTemplateSettings.burstObservatory.subjectSelector = newTemplateSettings.burstObservatory.subjectSelector.filter(s => s != removedBalancer.tag);
+                }
+
                 // Update balancers property to an empty array if there are no more balancers
                 if (newTemplateSettings.routing.balancers.length === 0) {
                     delete newTemplateSettings.routing.balancers;
                 }
                 this.templateSettings = newTemplateSettings;
+                this.changeObsCode()
             },
             addDNSServer(){
                 dnsModal.show({
@@ -1377,15 +1468,10 @@
                     data = []
                     if (this.templateSettings != null && this.templateSettings.routing != null && this.templateSettings.routing.balancers != null) {
                         this.templateSettings.routing.balancers.forEach((o, index) => {
-                            let strategy = "random"
-                            if (o.strategy && o.strategy.type == "roundRobin") {
-                                strategy = o.strategy.type
-                            }
-
                             data.push({ 
                                 'key': index,
                                 'tag': o.tag ? o.tag : "",
-                                'strategy': strategy,
+                                'strategy': o.strategy?.type ?? "random",
                                 'selector': o.selector ? o.selector : []
                             });
                         });
@@ -1393,6 +1479,42 @@
                     return data;
                 }
             },
+            observatory: {
+                get: function () { 
+                    return this.templateSettings?.observatory ? JSON.stringify(this.templateSettings.observatory, null, 2) : null;
+                },
+                set: function (newValue) {
+                    newTemplateSettings = this.templateSettings;
+                    newTemplateSettings.observatory = JSON.parse(newValue);
+                    this.templateSettings = newTemplateSettings;
+                },
+            },
+            burstObservatory: {
+                get: function () { 
+                    return this.templateSettings?.burstObservatory ? JSON.stringify(this.templateSettings.burstObservatory, null, 2) : null; 
+                },
+                set: function (newValue) {
+                    newTemplateSettings = this.templateSettings;
+                    newTemplateSettings.burstObservatory = JSON.parse(newValue);
+                    this.templateSettings = newTemplateSettings;
+                },
+            },
+            observatoryEnable: {
+                get: function () { return this.templateSettings != null && this.templateSettings.observatory },
+                set: function (v) {
+                    newTemplateSettings = this.templateSettings;
+                    newTemplateSettings.observatory = v ? this.defaultObservatory : undefined;
+                    this.templateSettings = newTemplateSettings;
+                }
+            },
+            burstObservatoryEnable: {
+                get: function () { return this.templateSettings != null && this.templateSettings.burstObservatory },
+                set: function (v) {
+                    newTemplateSettings = this.templateSettings;
+                    newTemplateSettings.burstObservatory = v ? this.defaultBurstObservatory : undefined;
+                    this.templateSettings = newTemplateSettings;
+                }
+            },
             freedomStrategy: {
                 get: function () {
                     if (!this.templateSettings) return "AsIs";
diff --git a/web/html/xui/xray_balancer_modal.html b/web/html/xui/xray_balancer_modal.html
index f9f132d9..13e7257e 100644
--- a/web/html/xui/xray_balancer_modal.html
+++ b/web/html/xui/xray_balancer_modal.html
@@ -21,6 +21,8 @@
             <a-select v-model="balancerModal.balancer.strategy" :dropdown-class-name="themeSwitcher.currentTheme">
                 <a-select-option value="random">Random</a-select-option>
                 <a-select-option value="roundRobin">Round Robin</a-select-option>
+                <a-select-option value="leastLoad">Least Load</a-select-option>
+                <a-select-option value="leastPing">Least Ping</a-select-option>
             </a-select>
         </a-form-item>
         <a-form-item label='{{ i18n "pages.xray.balancer.balancerSelectors" }}' has-feedback :validate-status="balancerModal.emptySelector? 'warning' : 'success'">