diff --git a/src/xdevice/_core/driver/parser_lite.py b/src/xdevice/_core/driver/parser_lite.py
index db5c52f..566b7dd 100755
--- a/src/xdevice/_core/driver/parser_lite.py
+++ b/src/xdevice/_core/driver/parser_lite.py
@@ -622,8 +622,7 @@ class CTestParser(IParser):
             except AttributeError:
                 LOG.error("parsing log: %s failed" % (line.strip()),
                           error_no="00405")
-            if line and line.strip():
-                self.last_line = line
+            self.last_line = line
 
     def _parse_product_info(self, line):
         if _PRODUCT_PARA_START in line:
diff --git a/src/xdevice/_core/environment/dmlib_lite.py b/src/xdevice/_core/environment/dmlib_lite.py
index c1e29c0..123c41d 100755
--- a/src/xdevice/_core/environment/dmlib_lite.py
+++ b/src/xdevice/_core/environment/dmlib_lite.py
@@ -228,17 +228,18 @@ class LiteHelper:
             data = com.readline().decode('gbk', errors='ignore')
             data = PATTERN.sub('', data)
             if isinstance(input_command, list):
-                data = "{} {}".format(get_current_time(), data)
-                if data and receiver:
-                    receiver.__read__(data.replace("\r", ""))
-                result = "{}{}".format(result, data.replace("\r", ""))
-                if re.search(r"\d+\s+Tests\s+\d+\s+Failures\s+\d+\s+"
-                             r"Ignored", data):
-                    start = time.time()
+                if len(data.strip()) > 0:
+                    data = "{} {}".format(get_current_time(), data)
+                    if data and receiver:
+                        receiver.__read__(data.replace("\r", ""))
+                    result = "{}{}".format(result, data.replace("\r", ""))
+                    if re.search(r"\d+\s+Tests\s+\d+\s+Failures\s+\d+\s+"
+                                 r"Ignored", data):
+                        start = time.time()
+                    if CTEST_END_SIGN in data:
+                        break
                 if (int(time.time()) - int(start)) > timeout:
                     break
-                if CTEST_END_SIGN in data:
-                    break
             else:
                 result = "{}{}".format(
                     result, data.replace("\r", "").replace("\n", "").strip())