diff --git a/templates/radar_guangzhou.html b/templates/radar_guangzhou.html
index baec20d..47cb019 100644
--- a/templates/radar_guangzhou.html
+++ b/templates/radar_guangzhou.html
@@ -104,6 +104,8 @@
   let gWindFromDeg = null, gWindSpeedMS = null;
   let gTimes = [];
   let gCurrentIdx = -1;
+  // 当前渲染瓦片的时间（用于 ETA 基准时间）
+  let gTileDT = null;
 
   function toRad(d){ return d * Math.PI / 180; }
   function toDeg(r){ return r * 180 / Math.PI; }
@@ -217,6 +219,8 @@
 
     try{
       const base = forcedDt ? new Date(forcedDt.replace(/-/g,'/')) : new Date(t.dt.replace(/-/g,'/'));
+      // 记录本次瓦片时间供 ETA 使用
+      gTileDT = base;
       const ceil10=new Date(base); const m=base.getMinutes(); const up=(Math.floor(m/10)*10+10)%60; ceil10.setMinutes(up,0,0); if(up===0){ ceil10.setHours(base.getHours()+1); }
       const pad=(n)=>String(n).padStart(2,'0'); const dtStr=`${ceil10.getFullYear()}-${pad(ceil10.getMonth()+1)}-${pad(ceil10.getDate())} ${pad(ceil10.getHours())}:${pad(ceil10.getMinutes())}:00`;
       await loadRealtimeAt(dtStr);
@@ -268,7 +272,10 @@
       const statusEl=document.getElementById('sectorStatus'); const detailEl=document.getElementById('sectorDetail');
       if(!best){ statusEl.textContent='无（≥40 dBZ）'; detailEl.classList.add('hidden'); }
       else {
-        const etaSec=best.dist/gWindSpeedMS; const eta=new Date(Date.now()+etaSec*1000);
+        const etaSec=best.dist/gWindSpeedMS;
+        // 使用雷达瓦片时间作为 ETA 基准
+        const base = gTileDT instanceof Date ? gTileDT : new Date();
+        const eta=new Date(base.getTime()+etaSec*1000);
         const pad=(n)=>String(n).padStart(2,'0'); const etaStr=`${eta.getFullYear()}-${pad(eta.getMonth()+1)}-${pad(eta.getDate())} ${pad(eta.getHours())}:${pad(eta.getMinutes())}`;
         document.getElementById('sectorDist').textContent=(best.dist/1000).toFixed(1);
         document.getElementById('sectorETA').textContent=etaStr;
diff --git a/templates/radar_nanning.html b/templates/radar_nanning.html
index 3c161bd..ad63338 100644
--- a/templates/radar_nanning.html
+++ b/templates/radar_nanning.html
@@ -103,6 +103,8 @@
         let gWindFromDeg = null, gWindSpeedMS = null;
         let gTimes = [];
         let gCurrentIdx = -1;
+        // 当前渲染瓦片的时间（用于 ETA 基准时间）
+        let gTileDT = null;
 
         async function loadLatestTile() {
             const res = await fetch('/api/radar/latest?z=7&y=40&x=102');
@@ -286,6 +288,8 @@
 
             try {
                 const dt = forcedDt ? new Date(forcedDt.replace(/-/g,'/')) : new Date(t.dt.replace(/-/g,'/'));
+                // 记录本次瓦片的时间，供 ETA 计算使用
+                gTileDT = dt;
                 const ceil10 = new Date(dt);
                 const m = dt.getMinutes();
                 const up = (Math.floor(m/10)*10 + 10) % 60;
@@ -421,7 +425,9 @@
                     detailEl.classList.add('hidden');
                 }else{
                     const etaSec = best.dist / gWindSpeedMS;
-                    const eta = new Date(Date.now() + etaSec*1000);
+                    // 使用雷达瓦片时间作为 ETA 基准
+                    const base = gTileDT instanceof Date ? gTileDT : new Date();
+                    const eta = new Date(base.getTime() + etaSec*1000);
                     const pad = (n)=> String(n).padStart(2,'0');
                     const etaStr = `${eta.getFullYear()}-${pad(eta.getMonth()+1)}-${pad(eta.getDate())} ${pad(eta.getHours())}:${pad(eta.getMinutes())}`;
                     document.getElementById('sectorDist').textContent = (best.dist/1000).toFixed(1);