diff --git a/models/mobilefacenet_arcface.rknn b/models/mobilefacenet_arcface.rknn
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diff --git a/scripts/__pycache__/onnx2rknn_prenorm.cpython-311.pyc b/scripts/__pycache__/onnx2rknn_prenorm.cpython-311.pyc
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Binary files /dev/null and b/scripts/__pycache__/onnx2rknn_prenorm.cpython-311.pyc differ
diff --git a/scripts/onnx2rknn_prenorm.py b/scripts/onnx2rknn_prenorm.py
new file mode 100644
index 0000000..9627d43
--- /dev/null
+++ b/scripts/onnx2rknn_prenorm.py
@@ -0,0 +1,183 @@
+import argparse
+
+import onnx
+from onnx import utils as onnx_utils
+from rknn.api import RKNN
+
+
+PASSTHRU_OPS = {
+    "Identity",
+    "Reshape",
+    "Squeeze",
+    "Unsqueeze",
+    "Flatten",
+    "Transpose",
+    "Cast",
+}
+
+
+NORM_CHAIN_OPS = {
+    "ReduceL2",
+    "Sqrt",
+    "Rsqrt",
+    "Reciprocal",
+    "Pow",
+    "Clip",
+    "Max",
+    "Min",
+    "Add",
+    "Sub",
+    "Mul",
+    "Div",
+    "ReduceSum",
+    "ReduceMean",
+    "Expand",
+    "Reshape",
+    "Squeeze",
+    "Unsqueeze",
+    "Cast",
+}
+
+
+def _build_producer_map(model: onnx.ModelProto):
+    prod = {}
+    for node in model.graph.node:
+        for o in node.output:
+            if o:
+                prod[o] = node
+    return prod
+
+
+def _is_reduce_l2_chain(tensor_name: str, prod_map) -> bool:
+    cur = tensor_name
+    for _ in range(50):
+        node = prod_map.get(cur)
+        if node is None:
+            return False
+        if node.op_type == "ReduceL2":
+            return True
+        if node.op_type not in NORM_CHAIN_OPS:
+            return False
+        if not node.input:
+            return False
+        cur = node.input[0]
+    return False
+
+
+def _find_prenorm_tensor(model: onnx.ModelProto, output_tensor: str) -> str | None:
+    prod = _build_producer_map(model)
+
+    cur = output_tensor
+    for _ in range(100):
+        node = prod.get(cur)
+        if node is None:
+            return None
+
+        if node.op_type in PASSTHRU_OPS and node.input:
+            cur = node.input[0]
+            continue
+
+        if node.op_type == "Div" and len(node.input) >= 2:
+            a, b = node.input[0], node.input[1]
+            a_is = _is_reduce_l2_chain(a, prod)
+            b_is = _is_reduce_l2_chain(b, prod)
+            if b_is and not a_is:
+                return a
+            if a_is and not b_is:
+                return b
+            return None
+
+        if node.op_type == "Mul" and len(node.input) >= 2:
+            a, b = node.input[0], node.input[1]
+            a_is = _is_reduce_l2_chain(a, prod)
+            b_is = _is_reduce_l2_chain(b, prod)
+            if b_is and not a_is:
+                return a
+            if a_is and not b_is:
+                return b
+            return None
+
+        return None
+
+    return None
+
+
+def _get_real_input_names(model: onnx.ModelProto):
+    init_names = {i.name for i in model.graph.initializer}
+    inputs = []
+    for i in model.graph.input:
+        if i.name and i.name not in init_names:
+            inputs.append(i.name)
+    return inputs
+
+
+def main():
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--onnx", default="mobilefacenet_arcface_bs1.onnx")
+    ap.add_argument("--out", default="mobilefacenet_arcface_prenorm.rknn")
+    ap.add_argument("--target", default="rk3588")
+    ap.add_argument("--onnx_out", default="mobilefacenet_arcface_prenorm.onnx")
+    ap.add_argument(
+        "--pre_norm_tensor",
+        default="",
+        help="手动指定“归一化前 embedding”的张量名（自动识别失败时用 Netron 查到后填这里）",
+    )
+    args = ap.parse_args()
+
+    model = onnx.load(args.onnx)
+    onnx.checker.check_model(model)
+
+    if not model.graph.output:
+        raise SystemExit("ERROR: ONNX has no graph outputs")
+
+    orig_out = model.graph.output[0].name
+    pre_norm = args.pre_norm_tensor.strip()
+    if not pre_norm:
+        pre_norm = _find_prenorm_tensor(model, orig_out) or ""
+
+    if not pre_norm:
+        raise SystemExit(
+            "ERROR: 自动寻找 pre-norm embedding 失败。\n"
+            "请用 Netron 打开 ONNX，找到输出归一化(L2Norm/ReduceL2)之前的 512D 张量名，"
+            "然后用 --pre_norm_tensor <name> 重新运行。"
+        )
+
+    input_names = _get_real_input_names(model)
+    if not input_names:
+        raise SystemExit("ERROR: ONNX has no real inputs")
+    in0 = input_names[0]
+
+    onnx_utils.extract_model(args.onnx, args.onnx_out, [in0], [pre_norm])
+    print(f"[OK] Extracted pre-norm ONNX: {args.onnx_out}")
+    print(f"     input={in0}")
+    print(f"     output(pre_norm)={pre_norm}")
+
+    rknn = RKNN(verbose=True)
+
+    rknn.config(
+        target_platform=args.target,
+        mean_values=[[127.5, 127.5, 127.5]],
+        std_values=[[128.0, 128.0, 128.0]],
+    )
+
+    ret = rknn.load_onnx(
+        model=args.onnx_out,
+        input_size_list=[[112, 112, 3]],
+    )
+    if ret != 0:
+        raise SystemExit(f"ERROR: load_onnx failed ret={ret}")
+
+    ret = rknn.build(do_quantization=False)
+    if ret != 0:
+        raise SystemExit(f"ERROR: build failed ret={ret}")
+
+    ret = rknn.export_rknn(args.out)
+    if ret != 0:
+        raise SystemExit(f"ERROR: export_rknn failed ret={ret}")
+
+    rknn.release()
+    print("OK:", args.out)
+
+
+if __name__ == "__main__":
+    main()