diff --git a/configs/test_cam1_face_det_rtsp_server.json b/configs/test_cam1_face_det_rtsp_server.json
index 2c9716f..7d51bf2 100644
--- a/configs/test_cam1_face_det_rtsp_server.json
+++ b/configs/test_cam1_face_det_rtsp_server.json
@@ -24,8 +24,8 @@
           "type": "preprocess",
           "role": "filter",
           "enable": true,
-          "dst_w": 640,
-          "dst_h": 640,
+          "dst_w": 320,
+          "dst_h": 320,
           "dst_format": "rgb",
           "keep_ratio": false,
           "use_rga": true
diff --git a/models/RetinaFace_mobile320.rknn b/models/RetinaFace_mobile320.rknn
index 66445a6..1e60a95 100644
Binary files a/models/RetinaFace_mobile320.rknn and b/models/RetinaFace_mobile320.rknn differ
diff --git a/plugins/ai_face_det/ai_face_det_node.cpp b/plugins/ai_face_det/ai_face_det_node.cpp
index 144600c..fd1ebb2 100644
--- a/plugins/ai_face_det/ai_face_det_node.cpp
+++ b/plugins/ai_face_det/ai_face_det_node.cpp
@@ -165,12 +165,14 @@ bool ExtractNc(const Tensor& t, int c, NcTensor& out) {
         // Common: [1, C, N] or [1, N, C]
         const uint32_t d1 = t.dims[1];
         const uint32_t d2 = t.dims[2];
-        if (static_cast<int>(d1) == c) {
-            n = static_cast<int>(d2);
-            transposed = true;  // CxN
-        } else if (static_cast<int>(d2) == c) {
+        if (static_cast<int>(d2) == c) {
             n = static_cast<int>(d1);
             transposed = false;  // NxC
+        } else if (static_cast<int>(d1) == c) {
+            n = static_cast<int>(d2);
+            transposed = true;  // CxN
+        } else {
+            return false;  // 明确拒绝，不 fallback
         }
     } else if (t.dims.size() == 2) {
         // [N, C] or [C, N]