diff --git a/stac_mosaic_api.py b/stac_mosaic_api.py
index 7400910..6d0108c 100644
--- a/stac_mosaic_api.py
+++ b/stac_mosaic_api.py
@@ -67,10 +67,12 @@ def bbox_mosaic(query: BBoxQuery):
         if not image_paths:
             raise HTTPException(status_code=404, detail="未查询到图像")
 
+        # TODO 这个函数的输入可以用*args, **kwargs，指定了max_size，后面记得改
         def part_reader(src_path, part):
             with Reader(src_path) as cog:
                 return cog.part(part, max_size=1024)
 
+        # TODO 目前部分读取和镶嵌一起做做的，以后做实验需要解耦
         img_buf = render_mosaic(image_paths, part_reader, query.bbox)
         return StreamingResponse(img_buf, media_type="image/png")
     except Exception as e:
@@ -88,7 +90,8 @@ def polygon_mosaic(polygon: GeoJSONPolygon = Body(...)):
             with Reader(src_path) as cog:
                 return cog.feature(feat, max_size=1024)
 
-        img_buf = render_mosaic(image_paths, feature_reader, polygon.model_dump())
+        img_buf = render_mosaic(
+            image_paths, feature_reader, polygon.model_dump())
         return StreamingResponse(img_buf, media_type="image/png")
     except Exception as e:
         raise HTTPException(status_code=500, detail=str(e))
diff --git a/stac_mosaic_stream_api.py b/stac_mosaic_stream_api.py
new file mode 100644
index 0000000..2b3a72e
--- /dev/null
+++ b/stac_mosaic_stream_api.py
@@ -0,0 +1,114 @@
+from fastapi import FastAPI, Query, Body, HTTPException
+from typing import List
+from pydantic import BaseModel
+from shapely.geometry import Polygon, mapping, shape
+from rio_tiler.io import Reader
+from rio_tiler.mosaic import mosaic_reader
+import requests
+from fastapi.responses import StreamingResponse
+from io import BytesIO
+import morecantile
+from starlette.responses import StreamingResponse
+
+# FastAPI 实例
+app = FastAPI(title="STAC Mosaic API")
+
+# STAC 配置
+STAC_API_URL = "http://localhost:8082"
+COLLECTION_ID = "geosat1"
+
+
+# ---------- 数据模型 ----------
+class BBoxQuery(BaseModel):
+    bbox: List[float]  # [minx, miny, maxx, maxy]
+
+
+class GeoJSONPolygon(BaseModel):
+    type: str
+    coordinates: List
+
+
+# ---------- 实用函数 ----------
+def fetch_tiles_by_polygon(polygon: GeoJSONPolygon) -> List[tuple]:
+    """
+    根据多边形获取相交的瓦片列表
+    """
+    zoom = 11
+    tms = morecantile.tms.get("WebMercatorQuad")
+    # 将 GeoJSONPolygon 转为 shapely Polygon
+    shapely_poly = shape(polygon.model_dump())
+    tiles = list(tms.tiles(*shapely_poly.bounds, zoom))
+
+    def tile_polygon(x, y, z):
+        bounds = tms.bounds(x, y, z)
+        return Polygon([
+            (bounds.left, bounds.bottom),
+            (bounds.left, bounds.top),
+            (bounds.right, bounds.top),
+            (bounds.right, bounds.bottom),
+            (bounds.left, bounds.bottom)
+        ])
+
+    intersecting_tiles = []
+    for x, y, z in tiles:
+        if shapely_poly.intersects(tile_polygon(x, y, z)):
+            intersecting_tiles.append((x, y, z))
+
+    return intersecting_tiles
+
+
+def fetch_items_by_tile(x, y, z) -> List[str]:
+    """
+    根据瓦片坐标 (x, y, z) 查询与该瓦片 bbox 相交的影像
+    """
+    tms = morecantile.tms.get("WebMercatorQuad")
+    bounds = tms.bounds(x, y, z)
+    bbox = [bounds.left, bounds.bottom, bounds.right, bounds.top]
+    url = f"{STAC_API_URL}/collections/{COLLECTION_ID}/items"
+    params = {"bbox": ",".join(map(str, bbox))}
+    r = requests.get(url, params=params)
+    r.raise_for_status()
+    data = r.json()
+    return [feat["assets"]["image"]["href"] for feat in data.get("features", [])]
+
+
+def tile_mosaic_buf(x, y, z):
+    image_paths = fetch_items_by_tile(x, y, z)
+    if not image_paths:
+        raise HTTPException(status_code=404, detail="未查询到图像")
+
+    def tile_reader(src_path, x, y, z):
+        with Reader(src_path) as cog:
+            return cog.tile(x, y, z, tilesize=256)
+    img, _ = mosaic_reader(image_paths, tile_reader, x, y, z)
+    buf = BytesIO(img.render(img_format="PNG"))
+    buf.seek(0)
+    return buf
+
+
+# ---------- API 路由 ----------
+@app.post("/polygon_tiles_mosaic_stream", summary="逐个返回瓦片镶嵌结果")
+def polygon_tiles_mosaic_stream(polygon: GeoJSONPolygon = Body(...)):
+    def tile_generator():
+        intersecting_tiles = fetch_tiles_by_polygon(polygon)
+        for x, y, z in intersecting_tiles:
+            buf = tile_mosaic_buf(x, y, z)
+            if buf:
+                # 每个 tile 之间用自定义分隔符分割，前端需配合解析
+                yield b"--tile-boundary--\n"
+                yield buf.read()
+
+            # TODO 下面的代码是可选的，如果需要返回瓦片的元数据，可以取消注释
+            # if buf:
+            #     img_bytes = buf.getvalue()
+            #     meta = {
+            #         "x": x,
+            #         "y": y,
+            #         "z": z,
+            #         "content_type": "image/png",
+            #         "length": len(img_bytes)
+            #     }
+            #     yield b"--tile-boundary--\n"
+            #     yield (json.dumps(meta) + "\n").encode("utf-8")
+            #     yield img_bytes
+    return StreamingResponse(tile_generator(), media_type="application/octet-stream")