diff --git a/backend/app/services/llm/enrichment.py b/backend/app/services/llm/enrichment.py
index bef0456..fc05796 100644
--- a/backend/app/services/llm/enrichment.py
+++ b/backend/app/services/llm/enrichment.py
@@ -60,7 +60,7 @@ DIARY_PARA_CLASS = "diary-para"
 # === 插图默认尺寸(适中,不再用 1024x768)===
 # 写死到 enrichment 里,行为稳定;setting.image_size 仍可由用户在 UI 改,
 # 但默认行为不依赖它,避免意外被改成很大。
-DEFAULT_IMAGE_SIZE = "768x512"
+DEFAULT_IMAGE_SIZE = "512x384"
 DEFAULT_IMAGE_FIRST_PARA_CHARS = 400  # 提取第一段最多用这么多字
 DEFAULT_IMAGE_MAX_TAGS = 5  # 分类标签上限(多标签)