diff --git a/tools/gen_header_for_bin_reduce.py b/tools/gen_header_for_bin_reduce.py
index d084f87e0b89cefca083ef3cf6e1ffa92751a01d..39fdf3005c2d889fa01e6d73cef5e3b4e5f92d1d 100755
--- a/tools/gen_header_for_bin_reduce.py
+++ b/tools/gen_header_for_bin_reduce.py
@@ -185,6 +185,18 @@ class HeaderGen:
         ).stdout.decode('utf-8')
         self._fout.write('// midout \n')
         self._fout.write(cvt)
+        if cvt.find(" half,"):
+            change = open(self._fout.name).read().replace(" half,", " __fp16,")
+            with open("fix_fp16_bin_reduce.h", "w") as fix_fp16:
+                fix_fp16.write(change)
+                msg = (
+                        "WARNING:\n"
+                        "hit half in trace, try use fix_fp16_bin_reduce.h when build failed with bin_reduce.h\n"
+                        "which caused by LLVM mangle issue on __fp16 dtype, if you find msg 'error: use of undeclared identifier 'half'\n"
+                        "then try use fix_fp16_bin_reduce.h, if build failed again, submit a issue to Engine team!!!"
+                        )
+                print(msg)
+
 
 def main():
     parser = argparse.ArgumentParser(