diff --git a/app/templates/postcard_form.html b/app/templates/postcard_form.html
index 03f296c..93255dc 100644
--- a/app/templates/postcard_form.html
+++ b/app/templates/postcard_form.html
@@ -28,9 +28,9 @@
 
     <div id="fields-received" style="display:none">
         <label>发件人 *</label>
-        <input type="text" name="sender_name" value="{{ postcard.sender_name if postcard else '' }}" required>
+        <input type="text" name="sender_name" id="input-sender" value="{{ postcard.sender_name if postcard else '' }}">
         <label>收到时间 *</label>
-        <input type="date" name="receive_time" value="{{ postcard.receive_time.strftime('%Y-%m-%d') if postcard and postcard.receive_time else '' }}" required>
+        <input type="date" name="receive_time" id="input-receive" value="{{ postcard.receive_time.strftime('%Y-%m-%d') if postcard and postcard.receive_time else '' }}">
     </div>
 
     <div class="form-actions">
@@ -45,13 +45,19 @@ function toggleFields() {
     var rc = document.getElementById('fields-received');
     var arrival = document.getElementById('input-arrival');
     var labelArrival = document.getElementById('label-arrival');
+    var sender = document.getElementById('input-sender');
+    var receive = document.getElementById('input-receive');
     if (s === 'received') {
         sd.style.display = 'none';
         rc.style.display = '';
+        sender.required = true;
+        receive.required = true;
         arrival.required = false;
     } else {
         sd.style.display = '';
         rc.style.display = 'none';
+        sender.required = false;
+        receive.required = false;
         if (s === 'delivered') {
             arrival.required = true;
             labelArrival.textContent = '到达时间 *';