diff --git a/logparser/Drain/Drain.py b/logparser/Drain/Drain.py
index 258a3b22..ab03ed23 100644
--- a/logparser/Drain/Drain.py
+++ b/logparser/Drain/Drain.py
@@ -4,13 +4,14 @@
 License     : MIT
 """
 
-import re
+import regex as re
 import os
 import numpy as np
 import pandas as pd
 import hashlib
 from datetime import datetime
-
+import math
+from collections import Counter
 
 class Logcluster:
     def __init__(self, logTemplate='', logIDL=None):
@@ -212,7 +213,8 @@ def outputResult(self, logClustL):
         self.df_log['EventId'] = log_templateids
         self.df_log['EventTemplate'] = log_templates
 
-        if self.keep_para:
+#         if self.keep_para:
+        if log_templates:
             self.df_log["ParameterList"] = self.df_log.apply(self.get_parameter_list, axis=1) 
         self.df_log.to_csv(os.path.join(self.savePath, self.logName + '_structured.csv'), index=False)
 
@@ -332,6 +334,15 @@ def generate_logformat_regex(self, logformat):
         regex = re.compile('^' + regex + '$')
         return headers, regex
 
+    def entropy(self, string):
+    ''' Used to encrypt the string parameter in ParameterList.
+
+    :param string: the string parameter
+    :return: the encrypted number
+    '''
+        letter_num, length_string = Counter(string), float(len(string))
+        return np.round(-sum(count/length_string * math.log(count/length_string, 10) for count in letter_num.values()),5)
+    
     def get_parameter_list(self, row):
         template_regex = re.sub(r"<.{1,5}>", "<*>", row["EventTemplate"])
         if "<*>" not in template_regex: return []
@@ -341,4 +352,5 @@ def get_parameter_list(self, row):
         parameter_list = re.findall(template_regex, row["Content"])
         parameter_list = parameter_list[0] if parameter_list else ()
         parameter_list = list(parameter_list) if isinstance(parameter_list, tuple) else [parameter_list]
-        return parameter_list
\ No newline at end of file
+        parameter_list = [self.entropy(string) for string in parameter_list]
+        return parameter_list
diff --git a/logparser/SHISO/SHISO.py b/logparser/SHISO/SHISO.py
index 813bf9ee..1f00bec3 100644
--- a/logparser/SHISO/SHISO.py
+++ b/logparser/SHISO/SHISO.py
@@ -7,8 +7,9 @@
 import re
 import os
 import time
+import multiprocessing as mp
 from nltk import ngrams
-from Queue import *
+# from Queue import *
 import numpy as np
 import pandas as pd
 import hashlib
@@ -293,7 +294,7 @@ def Adjust(self, pn, nidx, n):
 
     def outputResult(self, node):
         templateNo = 1
-        nodeQ = Queue()
+        nodeQ = mp.Queue()
         nodeQ.put(node)
 
         templates = [0] * self.df_log.shape[0]