diff --git a/Chatbot/QuestionAnswering/qaBase.py b/Chatbot/QuestionAnswering/qaBase.py
index b934f3a..286de9d 100644
--- a/Chatbot/QuestionAnswering/qaBase.py
+++ b/Chatbot/QuestionAnswering/qaBase.py
@@ -1,5 +1,36 @@
-from . import match
-from . import responsesEvaluate
+import json
+
+from .match import *
+from .responsesEvaluate import Evaluator
 
 class QABase(object):
-    pass
+
+    def __init__(self, data_path):
+
+        """
+        Args:
+            data_path: 指出 data 資料夾位在哪個位置
+        """
+        self.general_questions = []
+        self.data_path = data_path
+
+        self.matcher = getMatcher(matcherType="Fuzzy")
+        self.evaluator = Evaluator()
+
+    def getResponse(self, sentence, api_key=None):
+
+        if api_key is not None:
+            response = self.getCustomQA(sentence,api_key)
+        else:
+            response = self._getGeneralQA(sentence)
+        return response
+
+    def getGeneralQA(self, sentence):
+
+        pass
+
+    def getCustomQA(self, sentence, api_key):
+
+        #TODO GET USER'S QA BY api_key
+        #customqa_list = json.loads(getUserQA(api_key))
+        pass
diff --git a/Chatbot/QuestionAnswering/responsesEvaluate.py b/Chatbot/QuestionAnswering/responsesEvaluate.py
index f3d2423..813d3f9 100644
--- a/Chatbot/QuestionAnswering/responsesEvaluate.py
+++ b/Chatbot/QuestionAnswering/responsesEvaluate.py
@@ -138,7 +138,7 @@ def evaluateByGrade(self,topk,debug=False):
                     meanful += math.log(wordWeight,10)
                 cur_grade += wordWeight
 
-            cur_grade = cur_grade * meanful / math.log(len(self.segResponses[i])+1,avgWords)
+            cur_grade = cur_grade * meanful / (math.log(len(self.segResponses[i])+1,avgWords) + 1)
             candiates.append([self.responses[i],cur_grade])
 
             if debug:
diff --git a/Chatbot/log/exception_log b/Chatbot/log/exception_log
deleted file mode 100644
index e69de29..0000000