diff --git a/app/templates/classes.html b/app/templates/classes.html
index cf25ff5..a05f758 100644
--- a/app/templates/classes.html
+++ b/app/templates/classes.html
@@ -147,11 +147,11 @@
                     <div class="row g-2">
                         <div class="col-auto">
                             <select class="form-select" id="class-assign-assessment-days">
-                                <option value="">指定日期</option>
+                                <option value="">指定天数</option>
                                 <option value="15">15天后</option>
                                 <option value="30">30天后</option>
                                 <option value="60">60天后</option>
-                                <option value="90">90天后</option>
+                                <option value="90" selected>90天后</option>
                                 <option value="180">180天后</option>
                             </select>
                         </div>
diff --git a/app/templates/student.html b/app/templates/student.html
index 7ad5558..5bd398d 100644
--- a/app/templates/student.html
+++ b/app/templates/student.html
@@ -271,11 +271,11 @@
                     <div class="row g-2">
                         <div class="col-auto">
                             <select class="form-select" id="assign-assessment-days">
-                                <option value="">指定日期</option>
+                                <option value="">指定天数</option>
                                 <option value="15">15天后</option>
                                 <option value="30">30天后</option>
                                 <option value="60">60天后</option>
-                                <option value="90">90天后</option>
+                                <option value="90" selected>90天后</option>
                                 <option value="180">180天后</option>
                             </select>
                         </div>
@@ -975,8 +975,13 @@ async function loadGoalOptions() {
         .map(g => `<option value="${g.id}">${escapeHtml(g.name)} [${g.level || '入门'} - ${g.category || '综合'}]</option>`)
         .join('');
 
-    // 设置默认开始日期为今天
+    // 设置默认开始日期为今天，默认评估日期为90天后
     document.getElementById('assign-start-date').value = new Date().toISOString().split('T')[0];
+    document.getElementById('assign-assessment-days').value = '90';
+    // 联动设置评估日期
+    const d = new Date();
+    d.setDate(d.getDate() + 90);
+    document.getElementById('assign-assessment-date').value = d.toISOString().split('T')[0];
 }
 
 // 评估日期联动：选择天数后自动计算日期，或直接选日期