diff --git a/rag/nlp/query.py b/rag/nlp/query.py
index 34333a350..55b4e9d32 100644
--- a/rag/nlp/query.py
+++ b/rag/nlp/query.py
@@ -71,7 +71,19 @@ class FulltextQueryer:
             txt = otxt
         return txt
 
+    @staticmethod
+    def add_space_between_eng_zh(txt):
+        # (ENG/ENG+NUM) + ZH
+        txt = re.sub(r'([A-Za-z]+[0-9]+)([\u4e00-\u9fa5]+)', r'\1 \2', txt)
+        # ENG + ZH
+        txt = re.sub(r'([A-Za-z])([\u4e00-\u9fa5]+)', r'\1 \2', txt)
+        # ZH + (ENG/ENG+NUM)
+        txt = re.sub(r'([\u4e00-\u9fa5]+)([A-Za-z]+[0-9]+)', r'\1 \2', txt)
+        txt = re.sub(r'([\u4e00-\u9fa5]+)([A-Za-z])', r'\1 \2', txt)
+        return txt
+
     def question(self, txt, tbl="qa", min_match: float = 0.6):
+        txt = FulltextQueryer.add_space_between_eng_zh(txt)
         txt = re.sub(
             r"[ :|\r\n\t,，。？?/`!！&^%%()\[\]{}<>]+",
             " ",