diff --git a/tb/sw/src/check_intflag.py b/tb/sw/src/check_intflag.py
new file mode 100644
index 0000000..b44265a
--- /dev/null
+++ b/tb/sw/src/check_intflag.py
@@ -0,0 +1,56 @@
+#!/usr/bin/python3
+
+import os
+import sys
+import traceback
+import re
+
+
+
+def search_custom_inst(logfile, opcode, funct, xd = 0, xs1 = 0, xs2 = 0, xd_filter = 0, xs1_filter = 0, xs2_filter = 0):
+    lines = logfile.readlines()
+    funct3 = 0
+    if xd != 0:
+        funct3 = funct3 | 0x4
+    if xs1 != 0:
+        funct3 = funct3 | 0x2
+    if xs2 != 0:
+        funct3 = funct3 | 0x1
+
+    for line in lines:
+        inst = re.findall(r"inst=\[[\da-fA-F]{8}\]", line)
+        wreg = re.findall(r"W\[r[\ \d]{2}=[\da-fA-F]{8}\]", line)
+        rreg = re.findall(r"R\[r[\ \d]{2}=[\da-fA-F]{8}\]", line)
+        if len(inst) > 0:
+            inst = int('0x' + inst[0][6:-1], 16)
+            wreg_val = int('0x' + wreg[0][6:-1], 16)
+            rreg1_val = int('0x' + rreg[0][6:-1], 16)
+            rreg2_val = int('0x' + rreg[1][6:-1], 16)
+            ins_opcode = inst & 0x7f
+            #只对R系列的custom0进行解码
+            if opcode == ins_opcode:
+                ins_funct = (inst >> 25) & 0x7f
+                ins_funct3 = (inst >> 12) & 0x7
+                if (ins_funct == funct) and (funct3 == ins_funct3):
+                    outline = line.rstrip()
+                    if (xs1 != 0) and ((rreg1_val & xs1_filter) != 0):
+                        print(outline)
+                    if (xd != 0) and ((wreg_val & xd_filter) != 0):
+                        print(outline)
+                    if (xs2 != 0) and ((rreg2_val & xs2_filter) != 0):
+                        print(outline)
+                else:
+                    pass
+
+if __name__ == '__main__':
+    path = sys.argv[0]
+    path = path.split('/')[0:-1]
+    path = '/'.join(path)
+    logfile_path = path + '/../build/cpu1_log.txt'
+    if len(sys.argv) > 1:
+        logfile_path = sys.argv[1]
+    print(logfile_path)
+
+    with open(logfile_path, 'rt') as logfile:
+        search_custom_inst(logfile, 0xb, 0x17, xs1=1, xs1_filter=(1<<7))
+        logfile.close()