diff --git a/astrbot/core/provider/sources/anthropic_source.py b/astrbot/core/provider/sources/anthropic_source.py
index d982af2e4..a55a3a0a1 100644
--- a/astrbot/core/provider/sources/anthropic_source.py
+++ b/astrbot/core/provider/sources/anthropic_source.py
@@ -448,8 +448,14 @@ class ProviderAnthropic(Provider):
                     },
                 )
 
-        # 如果只有一个文本块且没有图片，返回简单格式以保持向后兼容
-        if len(content) == 1 and content[0]["type"] == "text":
+        # 如果只有主文本且没有额外内容块和图片，返回简单格式以保持向后兼容
+        if (
+            text
+            and not extra_content_blocks
+            and not image_urls
+            and len(content) == 1
+            and content[0]["type"] == "text"
+        ):
             return {"role": "user", "content": content[0]["text"]}
 
         # 否则返回多模态格式
diff --git a/astrbot/core/provider/sources/gemini_source.py b/astrbot/core/provider/sources/gemini_source.py
index 487acd431..614c83aad 100644
--- a/astrbot/core/provider/sources/gemini_source.py
+++ b/astrbot/core/provider/sources/gemini_source.py
@@ -839,8 +839,14 @@ class ProviderGoogleGenAI(Provider):
                     },
                 )
 
-        # 如果只有文本且没有额外内容块，返回简单格式以保持向后兼容
-        if len(content_blocks) == 1 and content_blocks[0]["type"] == "text":
+        # 如果只有主文本且没有额外内容块和图片，返回简单格式以保持向后兼容
+        if (
+            text
+            and not extra_content_blocks
+            and not image_urls
+            and len(content_blocks) == 1
+            and content_blocks[0]["type"] == "text"
+        ):
             return {"role": "user", "content": content_blocks[0]["text"]}
 
         # 否则返回多模态格式
diff --git a/astrbot/core/provider/sources/openai_source.py b/astrbot/core/provider/sources/openai_source.py
index 97bb992e7..fcd2e0e32 100644
--- a/astrbot/core/provider/sources/openai_source.py
+++ b/astrbot/core/provider/sources/openai_source.py
@@ -662,8 +662,14 @@ class ProviderOpenAIOfficial(Provider):
                     },
                 )
 
-        # 如果只有文本且没有额外内容块，返回简单格式以保持向后兼容
-        if len(content_blocks) == 1 and content_blocks[0]["type"] == "text":
+        # 如果只有主文本且没有额外内容块和图片，返回简单格式以保持向后兼容
+        if (
+            text
+            and not extra_content_blocks
+            and not image_urls
+            and len(content_blocks) == 1
+            and content_blocks[0]["type"] == "text"
+        ):
             return {"role": "user", "content": content_blocks[0]["text"]}
 
         # 否则返回多模态格式
diff --git a/packages/astrbot/process_llm_request.py b/packages/astrbot/process_llm_request.py
index 532aac219..f787970c7 100644
--- a/packages/astrbot/process_llm_request.py
+++ b/packages/astrbot/process_llm_request.py
@@ -242,6 +242,6 @@ class ProcessLLMRequest:
         # 统一包裹所有系统提醒
         if system_parts:
             system_content = (
-                "<system_reminder>" + "".join(system_parts) + "</system_reminder>"
+                "<system_reminder>" + "\n".join(system_parts) + "</system_reminder>"
             )
             req.extra_content_blocks.append({"type": "text", "text": system_content})