diff --git a/station_broadcast.lua b/station_broadcast.lua
index 069013e..11a7b49 100644
--- a/station_broadcast.lua
+++ b/station_broadcast.lua
@@ -2,7 +2,7 @@
 -- ============================================================================
 -- 1. Configuration & Constants
 -- ============================================================================
-local APP_VERSION_TEXT = "v1.0.41"
+local APP_VERSION_TEXT = "v1.0.42"
 
 local CONFIG = {
     CLOUD_URL = "ws://stabadmin.fse-media.group",
@@ -18,6 +18,7 @@ local CONFIG = {
     ALERT_CONFIRM_MS = 60000,
     ALERT_COOLDOWN_MS = 300000,
     APPROACHING_COOLDOWN_MS = 120000,
+    APPROACHING_STABLE_MS = 15000,
     DEBUG = true
 }
 
@@ -2406,7 +2407,15 @@ local function buildEtaLabel(etaSeconds, textEta)
             return "~" .. tostring(value) .. "m"
         end
     end
-    return tostring(math.max(0, tonumber(etaSeconds) or 0)) .. "s"
+    local secs = math.max(0, tonumber(etaSeconds) or 0)
+    local whole = math.floor(secs + 0.0001)
+    if whole >= 60 then
+        return string.format("%02d:%02d", math.floor(whole / 60), whole % 60)
+    end
+    if secs >= 10 then
+        return string.format("%02ds", whole)
+    end
+    return string.format("%.1fs", secs)
 end
 
 local function mapTrainStatusReason(statusId)
@@ -2494,6 +2503,7 @@ function Main.loop()
                 local elapsedSeconds = (now - (State.lastRefreshedEpoch or now)) / 1000
                 local currentTick = (data.LastRefreshed or 0) + math.floor(elapsedSeconds * (State.tickRate or 20))
                 local seenAlertKeys = {}
+                local seenApproachKeys = {}
 
                 cleanupTimestampMap(State.announcedApproaching, now, tonumber(CONFIG.APPROACHING_COOLDOWN_MS) or 120000)
                 cleanupTimestampMap(State.announcedAlerts, now, tonumber(CONFIG.ALERT_COOLDOWN_MS) or 300000)
@@ -2529,7 +2539,7 @@ function Main.loop()
                         local scheduledArrival = pickEarlierTick(st.ScheduledArrival, st.ScheduledDeparture)
                         local realArrival = pickEarlierTick(st.RealTimeArrival, st.RealTimeDeparture)
                         local etaTicks = realArrival - currentTick
-                        local etaSeconds = math.floor(etaTicks / (State.tickRate or 20))
+                        local etaSeconds = etaTicks / (State.tickRate or 20)
                         if etaSeconds < 0 then etaSeconds = 0 end
                         local announceKey = normalizeUpcomingKey(trainName, destination)
                         local etaLabel = buildEtaLabel(etaSeconds, etaTextByKey[announceKey])
@@ -2575,9 +2585,22 @@ function Main.loop()
                         end
                         
                         if etaSeconds >= 0 and etaSeconds < 30 then
-                            if not State.announcedApproaching[announceKey] then
+                            seenApproachKeys[announceKey] = true
+                            local pending = State.pendingApproaching[announceKey]
+                            if not pending then
+                                State.pendingApproaching[announceKey] = { since = now, lastEta = etaSeconds }
+                            else
+                                if etaSeconds > (tonumber(pending.lastEta) or etaSeconds) + 0.5 then
+                                    pending.since = now
+                                end
+                                pending.lastEta = etaSeconds
+                            end
+
+                            local stableMs = tonumber(CONFIG.APPROACHING_STABLE_MS) or 15000
+                            local currentPending = State.pendingApproaching[announceKey]
+                            if currentPending and (now - (currentPending.since or now)) >= stableMs and not State.announcedApproaching[announceKey] then
                                 State.announcedApproaching[announceKey] = now
-                                Utils.log("INFO", string.format("Train Approaching: %s (ETA: %ds, Delay: %dm)", trainName, etaSeconds, delayMinutes))
+                                Utils.log("INFO", string.format("Train Approaching: %s (ETA: %.1fs, Delay: %dm)", trainName, etaSeconds, delayMinutes))
                                 Network.send({
                                     type = "train_approaching",
                                     stationName = State.stationName,
@@ -2585,13 +2608,15 @@ function Main.loop()
                                     stationPlatform = platform,
                                     trainId = trainName,
                                     destination = destination,
-                                    eta = tostring(etaSeconds) .. "s",
+                                    eta = string.format("%.1fs", etaSeconds),
                                     etaSeconds = etaSeconds,
                                     delay = displayDelayMinutes,
                                     cancelled = cancelled,
                                     reason = reason
                                 })
                             end
+                        else
+                            State.pendingApproaching[announceKey] = nil
                         end
                     end
                 end
@@ -2601,6 +2626,11 @@ function Main.loop()
                         State.pendingAlerts[k] = nil
                     end
                 end
+                for k, _ in pairs(State.pendingApproaching) do
+                    if not seenApproachKeys[k] then
+                        State.pendingApproaching[k] = nil
+                    end
+                end
             end
         end
 
@@ -2608,6 +2638,7 @@ function Main.loop()
         if not Peripherals.blockReader and Peripherals.createTarget then
             local lines = Peripherals.createTarget.dump()
             local seenAlertKeys = {}
+            local seenApproachKeys = {}
 
             cleanupTimestampMap(State.announcedApproaching, now, tonumber(CONFIG.APPROACHING_COOLDOWN_MS) or 120000)
             cleanupTimestampMap(State.announcedAlerts, now, tonumber(CONFIG.ALERT_COOLDOWN_MS) or 300000)
@@ -2687,7 +2718,20 @@ function Main.loop()
 
                         -- 触发逻辑：当 ETA 已经明确小于30秒（包括15秒、现在等），且之前没有播报过
                         if etaSeconds >= 0 and etaSeconds < 30 then
-                            if not State.announcedApproaching[announceKey] then
+                            seenApproachKeys[announceKey] = true
+                            local pending = State.pendingApproaching[announceKey]
+                            if not pending then
+                                State.pendingApproaching[announceKey] = { since = now, lastEta = etaSeconds }
+                            else
+                                if etaSeconds > (tonumber(pending.lastEta) or etaSeconds) + 0.5 then
+                                    pending.since = now
+                                end
+                                pending.lastEta = etaSeconds
+                            end
+
+                            local stableMs = tonumber(CONFIG.APPROACHING_STABLE_MS) or 15000
+                            local currentPending = State.pendingApproaching[announceKey]
+                            if currentPending and (now - (currentPending.since or now)) >= stableMs and not State.announcedApproaching[announceKey] then
                                 State.announcedApproaching[announceKey] = now
                                 Utils.log("INFO", string.format("Train Approaching: %s (ETA: %ds, Delay: %dm)", tName, etaSeconds, delay))
                                 Network.send({
@@ -2702,6 +2746,8 @@ function Main.loop()
                                     delay = delay
                                 })
                             end
+                        else
+                            State.pendingApproaching[announceKey] = nil
                         end
                     end
                 end
@@ -2712,6 +2758,11 @@ function Main.loop()
                     State.pendingAlerts[k] = nil
                 end
             end
+            for k, _ in pairs(State.pendingApproaching) do
+                if not seenApproachKeys[k] then
+                    State.pendingApproaching[k] = nil
+                end
+            end
         end
 
         -- Update Upcoming Trains globally for the monitor