diff --git a/internal/web/ui.go b/internal/web/ui.go
index 5f11732..447ec35 100644
--- a/internal/web/ui.go
+++ b/internal/web/ui.go
@@ -1912,20 +1912,14 @@ func (u *UI) pageAlarms(w http.ResponseWriter, r *http.Request) {
     u.ensureDevicesLoaded()
     data := PageData{Title: "告警中心", Devices: u.registry.GetDevices()}
 
-    // Parse date filter: ?date=2026-05-12 or ?from=...&to=... (default: today)
+    // Parse date filter: default to past 7 days.
     q := r.URL.Query()
     today := time.Now().Format("2006-01-02")
+    weekAgo := time.Now().AddDate(0, 0, -7).Format("2006-01-02")
     from := strings.TrimSpace(q.Get("from"))
     to := strings.TrimSpace(q.Get("to"))
-    date := strings.TrimSpace(q.Get("date"))
-    if date != "" {
-        from = date
-        to = date
-    }
-    if from == "" {
-        from = today
-    }
-    if to == "" {
+    if from == "" && to == "" {
+        from = weekAgo
         to = today
     }
     // Parse page: ?page=N (default 1), ?per_page=N (default 20)
diff --git a/internal/web/ui/templates/alarms.html b/internal/web/ui/templates/alarms.html
index f82854b..1a53180 100644
--- a/internal/web/ui/templates/alarms.html
+++ b/internal/web/ui/templates/alarms.html
@@ -1,15 +1,18 @@
 {{define "alarms"}}
 <div class="card">
-  <form method="get" action="/ui/alarms" style="display:flex;gap:8px;align-items:center;margin-bottom:12px;flex-wrap:wrap">
-    <input type="date" name="from" value="{{.SelectedFrom}}" style="width:150px;font-size:12px">
+  <form method="get" action="/ui/alarms" style="display:flex;gap:8px;align-items:center;margin-bottom:12px;justify-content:space-between">
+    <span style="display:flex;gap:8px;align-items:center;flex-wrap:wrap">
+    <input type="date" name="from" value="{{.SelectedFrom}}" style="width:140px;font-size:12px">
     <span class="muted small">至</span>
-    <input type="date" name="to" value="{{.SelectedTo}}" style="width:150px;font-size:12px">
+    <input type="date" name="to" value="{{.SelectedTo}}" style="width:140px;font-size:12px">
     <button class="btn" style="font-size:12px;padding:4px 12px">筛选</button>
     <a href="/ui/alarms" class="btn ghost" style="font-size:11px">今天</a>
     <a href="/ui/alarms?from={{.WeekStart}}&to={{.WeekEnd}}" class="btn ghost" style="font-size:11px">本周</a>
     <a href="/ui/alarms?from={{.MonthStart}}&to={{.MonthEnd}}" class="btn ghost" style="font-size:11px">本月</a>
-    <a href="/ui/alarms?from=2000-01-01&to=2099-12-31" class="btn ghost" style="font-size:11px">全部</a>
-    <select name="per_page" onchange="this.form.submit()" style="font-size:11px;padding:2px 4px;margin-left:auto">
+    <a href="/ui/alarms?from=2020-01-01&to={{.SelectedTo}}" class="btn ghost" style="font-size:11px">全部</a>
+    </span>
+    <select name="per_page" onchange="this.form.submit()" style="font-size:11px;padding:2px 4px;width:90px;flex-shrink:0">
+      <option value="10" {{if eq .PerPage 10}}selected{{end}}>10条/页</option>
       <option value="20" {{if eq .PerPage 20}}selected{{end}}>20条/页</option>
       <option value="50" {{if eq .PerPage 50}}selected{{end}}>50条/页</option>
       <option value="100" {{if eq .PerPage 100}}selected{{end}}>100条/页</option>