diff --git a/tools/tiny-test-fw/DUT.py b/tools/tiny-test-fw/DUT.py
index 882afa1f99..652a6247d2 100644
--- a/tools/tiny-test-fw/DUT.py
+++ b/tools/tiny-test-fw/DUT.py
@@ -117,7 +117,7 @@ class _DataCache(_queue.Queue):
                 break
         return ret
 
-    def get_data(self, timeout=0):
+    def get_data(self, timeout=0.0):
         """
         get a copy of data from cache.
 
@@ -214,6 +214,7 @@ class BaseDUT(object):
     """
 
     DEFAULT_EXPECT_TIMEOUT = 5
+    MAX_EXPECT_FAILURES_TO_SAVED = 10
 
     def __init__(self, name, port, log_file, app, **kwargs):
 
@@ -224,12 +225,18 @@ class BaseDUT(object):
         self.app = app
         self.data_cache = _DataCache()
         self.receive_thread = None
+        self.expect_failures = []
         # open and start during init
         self.open()
 
     def __str__(self):
         return "DUT({}: {})".format(self.name, str(self.port))
 
+    def _save_expect_failure(self, pattern, data, start_time):
+        self.expect_failures.insert(0, {"pattern": pattern, "data": data,
+                                        "start": start_time, "end": time.time()})
+        self.expect_failures = self.expect_failures[:self.MAX_EXPECT_FAILURES_TO_SAVED]
+
     # define for methods need to be overwritten by Port
     @classmethod
     def list_available_ports(cls):
@@ -444,7 +451,9 @@ class BaseDUT(object):
             data = self.data_cache.get_data(time.time() + timeout - start_time)
 
         if ret is None:
-            raise ExpectTimeout(self.name + ": " + _pattern_to_string(pattern))
+            pattern = _pattern_to_string(pattern)
+            self._save_expect_failure(pattern, data, start_time)
+            raise ExpectTimeout(self.name + ": " + pattern)
         return ret
 
     def _expect_multi(self, expect_all, expect_item_list, timeout):
@@ -508,7 +517,9 @@ class BaseDUT(object):
             # flush already matched data
             self.data_cache.flush(slice_index)
         else:
-            raise ExpectTimeout(self.name + ": " + str([_pattern_to_string(x) for x in expect_items]))
+            pattern = str([_pattern_to_string(x["pattern"]) for x in expect_items])
+            self._save_expect_failure(pattern, data, start_time)
+            raise ExpectTimeout(self.name + ": " + pattern)
 
     @_expect_lock
     def expect_any(self, *expect_items, **timeout):
@@ -554,6 +565,22 @@ class BaseDUT(object):
             timeout["timeout"] = self.DEFAULT_EXPECT_TIMEOUT
         return self._expect_multi(True, expect_items, **timeout)
 
+    @staticmethod
+    def _format_ts(ts):
+        return "{}:{}".format(time.strftime("%m-%d %H:%M:%S", time.localtime(ts)), str(ts % 1)[2:5])
+
+    def print_debug_info(self):
+        """
+        Print debug info of current DUT. Currently we will print debug info for expect failures.
+        """
+        Utility.console_log("DUT debug info for DUT: {}:".format(self.name), color="orange")
+
+        for failure in self.expect_failures:
+            Utility.console_log("\t[pattern]: {}\r\n\t[data]: {}\r\n\t[time]: {} - {}\r\n"
+                                .format(failure["pattern"], failure["data"],
+                                        self._format_ts(failure["start"]), self._format_ts(failure["end"])),
+                                color="orange")
+
 
 class SerialDUT(BaseDUT):
     """ serial with logging received data feature """
@@ -574,17 +601,14 @@ class SerialDUT(BaseDUT):
         self.serial_configs.update(kwargs)
         super(SerialDUT, self).__init__(name, port, log_file, app, **kwargs)
 
-    @staticmethod
-    def _format_data(data):
+    def _format_data(self, data):
         """
         format data for logging. do decode and add timestamp.
 
         :param data: raw data from read
         :return: formatted data (str)
         """
-        timestamp = time.time()
-        timestamp = "[{}:{}]".format(time.strftime("%m-%d %H:%M:%S", time.localtime(timestamp)),
-                                     str(timestamp % 1)[2:5])
+        timestamp = "[{}]".format(self._format_ts(time.time()))
         formatted_data = timestamp.encode() + b"\r\n" + data + b"\r\n"
         return formatted_data
 
diff --git a/tools/tiny-test-fw/Env.py b/tools/tiny-test-fw/Env.py
index b623847edb..b18df22737 100644
--- a/tools/tiny-test-fw/Env.py
+++ b/tools/tiny-test-fw/Env.py
@@ -162,14 +162,17 @@ class Env(object):
         return if_addr[self.PROTO_MAP[proto]][0]
 
     @_synced
-    def close(self):
+    def close(self, dut_debug=False):
         """
         close()
         close all DUTs of the Env.
 
+        :param dut_debug: if dut_debug is True, then print all dut expect failures before close it
         :return: None
         """
         for dut_name in self.allocated_duts:
             dut = self.allocated_duts[dut_name]["dut"]
+            if dut_debug:
+                dut.print_debug_info()
             dut.close()
         self.allocated_duts = dict()
diff --git a/tools/tiny-test-fw/TinyFW.py b/tools/tiny-test-fw/TinyFW.py
index a2c406b5d8..a0314e37b9 100644
--- a/tools/tiny-test-fw/TinyFW.py
+++ b/tools/tiny-test-fw/TinyFW.py
@@ -154,6 +154,7 @@ def test_method(**kwargs):
             xunit_file = os.path.join(env_inst.app_cls.get_log_folder(env_config["test_suite_name"]),
                                       XUNIT_FILE_NAME)
             XUNIT_RECEIVER.begin_case(test_func.__name__, time.time(), test_func_file_name)
+            result = False
             try:
                 Utility.console_log("starting running test: " + test_func.__name__, color="green")
                 # execute test function
@@ -163,12 +164,11 @@ def test_method(**kwargs):
             except Exception as e:
                 # handle all the exceptions here
                 traceback.print_exc()
-                result = False
                 # log failure
                 XUNIT_RECEIVER.failure(str(e), test_func_file_name)
             finally:
-                # do close all DUTs
-                env_inst.close()
+                # do close all DUTs, if result is False then print DUT debug info
+                env_inst.close(dut_debug=(not result))
             # end case and output result
             XUNIT_RECEIVER.end_case(test_func.__name__, time.time())
             with open(xunit_file, "ab+") as f: