diff --git a/backend/package/yuxi/agents/buildin/deep_agent/graph.py b/backend/package/yuxi/agents/buildin/deep_agent/graph.py
index 3050b9ec..706ec3b1 100644
--- a/backend/package/yuxi/agents/buildin/deep_agent/graph.py
+++ b/backend/package/yuxi/agents/buildin/deep_agent/graph.py
@@ -21,13 +21,14 @@ from yuxi.services.mcp_service import get_tools_from_all_servers
 from yuxi.services.subagent_service import get_subagents_from_names
 from yuxi.utils import logger
 
-from .prompt import DEEP_PROMPT
+from .context import DeepContext
 
 
 class DeepAgent(BaseAgent):
     name = "深度分析"
     description = "具备规划、深度分析和子智能体协作能力的智能体，可以处理复杂的多步骤任务"
     capabilities = ["file_upload", "files"]  # 支持文件上传功能
+    context_schema = DeepContext
     metadata = {"examples": ["调研一下多模态 GraphRAG 的相关论文"]}
 
     def __init__(self, **kwargs):
@@ -52,7 +53,6 @@ class DeepAgent(BaseAgent):
     async def get_graph(self, context=None, **kwargs):
 
         context = context or self.context_schema()  # 获取上下文配置
-        system_prompt = f"{DEEP_PROMPT.strip()}\n\n{context.system_prompt or ''}"
 
         model = load_chat_model(context.model)
         sub_model = load_chat_model(context.subagents_model)
@@ -93,7 +93,8 @@ class DeepAgent(BaseAgent):
         # 使用 create_deep_agent 创建深度智能体
         graph = create_agent(
             model=model,
-            system_prompt=system_prompt,
+            # RuntimeConfigMiddleware injects context.system_prompt before each model call.
+            system_prompt="",
             middleware=[
                 FilesystemMiddleware(backend=create_agent_composite_backend),  # 文件系统后端
                 RuntimeConfigMiddleware(extra_tools=all_mcp_tools),
diff --git a/backend/test/unit/agents/test_deep_agent_context.py b/backend/test/unit/agents/test_deep_agent_context.py
new file mode 100644
index 00000000..3e1910dd
--- /dev/null
+++ b/backend/test/unit/agents/test_deep_agent_context.py
@@ -0,0 +1,37 @@
+import ast
+from pathlib import Path
+
+
+def test_deep_agent_uses_deep_context_schema():
+    graph_path = (
+        Path(__file__).parents[3] / "package" / "yuxi" / "agents" / "buildin" / "deep_agent" / "graph.py"
+    )
+    module = ast.parse(graph_path.read_text(encoding="utf-8"))
+    deep_agent = next(
+        node for node in module.body if isinstance(node, ast.ClassDef) and node.name == "DeepAgent"
+    )
+    context_schema = next(
+        node
+        for node in deep_agent.body
+        if isinstance(node, ast.Assign)
+        and any(isinstance(target, ast.Name) and target.id == "context_schema" for target in node.targets)
+    )
+
+    assert isinstance(context_schema.value, ast.Name)
+    assert context_schema.value.id == "DeepContext"
+
+
+def test_deep_agent_does_not_prepend_context_system_prompt_before_runtime_middleware():
+    graph_path = (
+        Path(__file__).parents[3] / "package" / "yuxi" / "agents" / "buildin" / "deep_agent" / "graph.py"
+    )
+    module = ast.parse(graph_path.read_text(encoding="utf-8"))
+    create_agent = next(
+        node
+        for node in ast.walk(module)
+        if isinstance(node, ast.Call) and isinstance(node.func, ast.Name) and node.func.id == "create_agent"
+    )
+    system_prompt = next(keyword.value for keyword in create_agent.keywords if keyword.arg == "system_prompt")
+
+    assert isinstance(system_prompt, ast.Constant)
+    assert system_prompt.value == ""
diff --git a/docs/develop-guides/roadmap.md b/docs/develop-guides/roadmap.md
index 5a11366c..c7dc69d7 100644
--- a/docs/develop-guides/roadmap.md
+++ b/docs/develop-guides/roadmap.md
@@ -36,7 +36,7 @@
 
 ### 0.6.3 开发记录
 
-<!-- 0.6.3 的内容请放在这里 -->
+- 修复 DeepAgent 未绑定 `DeepContext`，导致深度分析专用系统提示词和子智能体默认模型配置未生效的问题；同时避免运行时重复注入默认提示词。
 
 ---