diff --git a/paddle/fluid/operators/reader/ctr_reader.cc b/paddle/fluid/operators/reader/ctr_reader.cc
index 26092c17e472463d2f468fc7c3cd8202bf93fbac..cb86f4c613cf225842aaba1db6c579399e3b852a 100644
--- a/paddle/fluid/operators/reader/ctr_reader.cc
+++ b/paddle/fluid/operators/reader/ctr_reader.cc
@@ -222,7 +222,7 @@ void ReadThread(const std::vector<std::string>& file_list,
 
     if (i != 0 && i % 100 == 0) {
       uint64_t t1 = GetTimeInSec();
-      float line_per_s = 100 * batch_size / static_cast<int>(t1 - t0);
+      float line_per_s = 100 * batch_size * 1000000 / (t1 - t0);
       VLOG(3) << "[" << thread_id << "]"
               << " line_per_second = " << line_per_s;
       t0 = t1;
diff --git a/paddle/fluid/operators/reader/ctr_reader.h b/paddle/fluid/operators/reader/ctr_reader.h
index 32dfed8264861c15fdadc492b944bdd9b833177f..89f63364c8d3df067bef15651f9aa380c8f81152 100644
--- a/paddle/fluid/operators/reader/ctr_reader.h
+++ b/paddle/fluid/operators/reader/ctr_reader.h
@@ -43,7 +43,7 @@ inline uint64_t GetTimeInSec() {
   using clock = std::conditional<std::chrono::high_resolution_clock::is_steady,
                                  std::chrono::high_resolution_clock,
                                  std::chrono::steady_clock>::type;
-  return std::chrono::duration_cast<std::chrono::seconds>(
+  return std::chrono::duration_cast<std::chrono::microseconds>(
              clock::now().time_since_epoch())
       .count();
 }
diff --git a/paddle/fluid/operators/reader/ctr_reader_test.cc b/paddle/fluid/operators/reader/ctr_reader_test.cc
index 6ca0b26a0d71a9d32a9ced03cb6434321b4f695e..51fbdf2d0794d5b9e217cb27ca5893b23e780030 100644
--- a/paddle/fluid/operators/reader/ctr_reader_test.cc
+++ b/paddle/fluid/operators/reader/ctr_reader_test.cc
@@ -35,7 +35,7 @@ TEST(CTR_READER, read_data) {
   std::shared_ptr<LoDTensorBlockingQueue> queue = queue_holder.GetQueue();
 
   int batch_size = 10;
-  int thread_num = 4;
+  int thread_num = 3;
   std::vector<std::string> slots = {
       "6002", "6003", "6004", "6005", "6006", "6007", "6008", "6009", "6010",
       "6011", "6012", "6013", "6014", "6015", "6016", "6017", "6018", "6019",
@@ -119,12 +119,15 @@ TEST(CTR_READER, read_data) {
 
   std::cout << "start to reader data" << std::endl;
   std::vector<LoDTensor> out;
-  int read_batch = 1000;
+  int read_batch = 10000;
   uint64_t t0 = GetTimeInSec();
   for (int i = 0; i < read_batch; ++i) {
     reader.ReadNext(&out);
+    if (i != 0 && i % 100 == 0) {
+      uint64_t t1 = GetTimeInSec();
+      float line_per_s = 100 * batch_size * 1000000 / (t1 - t0);
+      VLOG(3) << "line_per_second = " << line_per_s;
+      t0 = GetTimeInSec();
+    }
   }
-  uint64_t t1 = GetTimeInSec();
-  float line_per_s = read_batch * batch_size / static_cast<int>(t1 - t0);
-  VLOG(3) << "line_per_second = " << line_per_s;
 }