diff --git a/api/s0_base.py b/api/s0_base.py
index f813d66..e495a30 100644
--- a/api/s0_base.py
+++ b/api/s0_base.py
@@ -108,10 +108,10 @@ def get_nodes_id_and_type(name: str) -> dict[str, str]:
     return nodes_id_and_type
 
 # DingZQ 2024-12-31
-def get_major_nodes(name: str) -> list[str]:
+def get_major_nodes(name: str, diameter: int) -> list[str]:
     major_nodes_set = set()
     with conn[name].cursor(row_factory=dict_row) as cur:
-        cur.execute(f"select node1, node2 from pipes where diameter > 0")
+        cur.execute(f"select node1, node2 from pipes where diameter > {diameter}")
         for record in cur:
             major_nodes_set.add(record['node1'])
             major_nodes_set.add(record['node2'])
@@ -154,10 +154,10 @@ def get_links_id_and_type(name: str) -> dict[str, str]:
 
 # DingZQ 2024-12-31
 # 获取直径大于800的管道
-def get_major_pipes(name: str) -> list[str]:
+def get_major_pipes(name: str, diameter: int) -> list[str]:
     major_pipe_ids: list[str] = []
     with conn[name].cursor(row_factory=dict_row) as cur:
-        cur.execute(f"select id from pipes where diameter > 0 order by id")
+        cur.execute(f"select id from pipes where diameter > {diameter} order by id")
         for record in cur:
             major_pipe_ids.append(record['id'])
     return major_pipe_ids
diff --git a/main.py b/main.py
index 58d8fa1..3f977d0 100644
--- a/main.py
+++ b/main.py
@@ -1407,8 +1407,8 @@ async def fastapi_get_network_coords(network: str) -> list[str] | None:
 # id:type:x:y
 # type: junction, reservoir, tank
 @app.get("/getmajornodecoords/")
-async def fastapi_get_major_node_coords(network: str) -> list[str] | None:
-    coords = get_major_node_coords(network)
+async def fastapi_get_major_node_coords(network: str, diameter: int) -> list[str] | None:
+    coords = get_major_node_coords(network, diameter)
     result = []
     for node_id, coord in coords.items():
         result.append(f"{node_id}:{coord['type']}:{coord['x']}:{coord['y']}")
@@ -1423,8 +1423,8 @@ async def fastapi_get_network_link_nodes(network: str) -> list[str] | None:
 # DingZQ 2024-12-31
 # 获取直径大于800的管道
 @app.get("/getmajorpipenodes/")
-async def fastapi_get_major_pipe_nodes(network: str) -> list[str] | None:
-    return get_major_pipe_nodes(network)
+async def fastapi_get_major_pipe_nodes(network: str, diameter: int) -> list[str] | None:
+    return get_major_pipe_nodes(network, diameter)
 
 ############################################################
 # vertex 25.[VERTICES]
diff --git a/tjnetwork.py b/tjnetwork.py
index 442ea07..38ec977 100644
--- a/tjnetwork.py
+++ b/tjnetwork.py
@@ -846,9 +846,9 @@ def get_network_node_coords(name: str) -> dict[str, dict[str, float]]:
 
 # DingZQ 2024-12-31
 # id, x, y, type
-def get_major_node_coords(name: str) -> dict[str, dict[str, float]]:
+def get_major_node_coords(name: str, diameter: int) -> dict[str, dict[str, float]]:
     nodes_id_and_type = api.get_nodes_id_and_type(name)
-    major_node_ids = api.get_major_nodes(name)
+    major_node_ids = api.get_major_nodes(name, diameter)
     result = {}
     for node_id in major_node_ids:
         coord = api.get_node_coord(name, node_id)
@@ -868,8 +868,8 @@ def get_network_link_nodes(name: str) -> list[str]:
 
 # DingZQ 2024-12-31
 # link_id:pipe:node_id1:node_id2
-def get_major_pipe_nodes(name: str) -> list[str]:
-    major_pipe_ids = api.get_major_pipes(name)
+def get_major_pipe_nodes(name: str, diameter: int) -> list[str]:
+    major_pipe_ids = api.get_major_pipes(name, diameter)
     result = []
     for link_id in major_pipe_ids:
         nodes = api.get_link_nodes(name, link_id)