diff --git a/static/js/main.js b/static/js/main.js
index f0dae56..9f7c00e 100644
--- a/static/js/main.js
+++ b/static/js/main.js
@@ -457,9 +457,10 @@ document.addEventListener('paste', (e) => {
     }
 });
 
+const SIZE_MODELS = ['nano-banana-2', 'gemini-3.1-flash-image-preview'];
+
 document.getElementById('modelSelect').onchange = (e) => {
-    const sizeModels = ['nano-banana-2', 'gemini-3.1-flash-image-preview'];
-    document.getElementById('sizeGroup').classList.toggle('hidden', !sizeModels.includes(e.target.value));
+    document.getElementById('sizeGroup').classList.toggle('hidden', !SIZE_MODELS.includes(e.target.value));
     updateCostPreview(); // 切换模型时更新计费预览
 };
 
@@ -1037,6 +1038,12 @@ async function refreshPromptsList() {
         fillSelect('ratioSelect', d.ratios);
         fillSelect('sizeSelect', d.sizes);
 
+        // 初始化后检查默认模型是否需要显示尺寸选择器
+        const modelSelect = document.getElementById('modelSelect');
+        if (modelSelect && typeof SIZE_MODELS !== 'undefined') {
+            document.getElementById('sizeGroup').classList.toggle('hidden', !SIZE_MODELS.includes(modelSelect.value));
+        }
+
         const userPrompts = await loadUserPrompts();
 
         const mergedPrompts = [