diff --git a/configs/dcn/yolov3_enhance_reader.yml b/configs/dcn/yolov3_enhance_reader.yml
index 228e5558aa1c616021823aa7f99ac4748a1a9826..3ac7c2444e196ebdac9644787cf581ecee10086a 100644
--- a/configs/dcn/yolov3_enhance_reader.yml
+++ b/configs/dcn/yolov3_enhance_reader.yml
@@ -44,7 +44,7 @@ TrainReader:
   shuffle: true
   drop_last: true
   worker_num: 8
-  bufsize: 32
+  bufsize: 2
   use_process: true
 
 EvalReader:
@@ -76,7 +76,7 @@ EvalReader:
   batch_size: 8
   drop_empty: false
   worker_num: 8
-  bufsize: 32
+  bufsize: 2
 
 TestReader:
   inputs_def:
diff --git a/configs/ssd/ssd_mobilenet_v1_voc.yml b/configs/ssd/ssd_mobilenet_v1_voc.yml
index b0d22730e3a73bf3e0056c06cbd03925b05be315..0dea3081007da13d4f421a0c6c3853a9a43e9d44 100644
--- a/configs/ssd/ssd_mobilenet_v1_voc.yml
+++ b/configs/ssd/ssd_mobilenet_v1_voc.yml
@@ -89,7 +89,7 @@ TrainReader:
   shuffle: true
   drop_last: true
   worker_num: 8
-  bufsize: 16
+  bufsize: 2
   use_process: true
 
 EvalReader:
@@ -116,7 +116,7 @@ EvalReader:
     std: [127.502231, 127.502231, 127.502231]
   batch_size: 32
   worker_num: 8
-  bufsize: 32
+  bufsize: 2
   use_process: false
 
 TestReader:
diff --git a/configs/ssd/ssd_vgg16_300.yml b/configs/ssd/ssd_vgg16_300.yml
index fed09072dbf03ad6517c2e59f16720bf54f36598..c0864a6b3f73224f8ff372b8f5da1c9371d146ff 100644
--- a/configs/ssd/ssd_vgg16_300.yml
+++ b/configs/ssd/ssd_vgg16_300.yml
@@ -93,7 +93,7 @@ TrainReader:
   batch_size: 8
   shuffle: true
   worker_num: 8
-  bufsize: 32
+  bufsize: 2
   use_process: true
   drop_empty: true
 
@@ -123,7 +123,7 @@ EvalReader:
     std: [1, 1, 1]
   batch_size: 16
   worker_num: 8
-  bufsize: 32
+  bufsize: 2
 
 TestReader:
   inputs_def:
diff --git a/configs/ssd/ssd_vgg16_300_voc.yml b/configs/ssd/ssd_vgg16_300_voc.yml
index 75944286c4662f599d2166db7c8a1134c81ffc04..f0d9a5dc29ec5347ece3c74edada10e3abf73f32 100644
--- a/configs/ssd/ssd_vgg16_300_voc.yml
+++ b/configs/ssd/ssd_vgg16_300_voc.yml
@@ -93,7 +93,7 @@ TrainReader:
   batch_size: 8
   shuffle: true
   worker_num: 8
-  bufsize: 32
+  bufsize: 2
   use_process: true
 
 EvalReader:
@@ -122,7 +122,7 @@ EvalReader:
     std: [1, 1, 1]
   batch_size: 32
   worker_num: 8
-  bufsize: 32
+  bufsize: 2
 
 TestReader:
   inputs_def:
diff --git a/configs/ssd/ssd_vgg16_512.yml b/configs/ssd/ssd_vgg16_512.yml
index 1383acf4253383524c6e792ee0a366e5d9dbc56d..ef816d8dd62bf9b69a17c69e3f45d388bc2ce245 100644
--- a/configs/ssd/ssd_vgg16_512.yml
+++ b/configs/ssd/ssd_vgg16_512.yml
@@ -96,7 +96,7 @@ TrainReader:
   batch_size: 8
   shuffle: true
   worker_num: 8
-  bufsize: 32
+  bufsize: 2
   use_process: true
 
 EvalReader:
@@ -124,7 +124,7 @@ EvalReader:
     std: [1, 1, 1]
   batch_size: 8
   worker_num: 8
-  bufsize: 32
+  bufsize: 2
   drop_empty: false
 
 TestReader:
diff --git a/configs/ssd/ssd_vgg16_512_voc.yml b/configs/ssd/ssd_vgg16_512_voc.yml
index dc567de7c86e1abff93d9e830ab13b02e22e4e3e..512f2a6d8a995c3ae4648cc4c4847a63a9c4d7de 100644
--- a/configs/ssd/ssd_vgg16_512_voc.yml
+++ b/configs/ssd/ssd_vgg16_512_voc.yml
@@ -97,7 +97,7 @@ TrainReader:
   batch_size: 8
   shuffle: true
   worker_num: 8
-  bufsize: 32
+  bufsize: 2
   use_process: true
 
 EvalReader:
@@ -126,7 +126,7 @@ EvalReader:
     std: [1, 1, 1]
   batch_size: 32
   worker_num: 8
-  bufsize: 32
+  bufsize: 2
 
 TestReader:
   inputs_def:
diff --git a/configs/yolov3_reader.yml b/configs/yolov3_reader.yml
index e539408d13c199c3bd92bce56167f832c7a77d8f..cdf8e6a83134646e07d511b38616c7739a98b266 100644
--- a/configs/yolov3_reader.yml
+++ b/configs/yolov3_reader.yml
@@ -51,7 +51,7 @@ TrainReader:
   mixup_epoch: 250
   drop_last: true
   worker_num: 8
-  bufsize: 32
+  bufsize: 2
   use_process: true
 
 
@@ -63,7 +63,7 @@ EvalReader:
     !COCODataSet
       image_dir: val2017
       anno_path: annotations/instances_val2017.json
-      dataset_dir: dataset/coco
+      dataset_dir: dataset/coco 
       with_background: false
   sample_transforms:
     - !DecodeImage
diff --git a/ppdet/data/parallel_map.py b/ppdet/data/parallel_map.py
index 7517157cdbeaf597fc7c5cb4c57db4153c90fbf5..cc9f1b6eda9169be999fff0d1d56bd4c602b7875 100644
--- a/ppdet/data/parallel_map.py
+++ b/ppdet/data/parallel_map.py
@@ -60,7 +60,7 @@ class ParallelMap(object):
                  source,
                  worker,
                  worker_num,
-                 bufsize=100,
+                 bufsize=2,
                  use_process=False,
                  memsize='3G'):
         self._worker_num = worker_num
diff --git a/ppdet/data/reader.py b/ppdet/data/reader.py
index 04eb749ed1a615d7474bbcfba425bc927193509d..0e814af256010ed2d2d39d7ecaaa3d9592dcfa47 100644
--- a/ppdet/data/reader.py
+++ b/ppdet/data/reader.py
@@ -195,7 +195,7 @@ class Reader(object):
                  use_process=False,
                  use_fine_grained_loss=False,
                  num_classes=80,
-                 bufsize=100,
+                 bufsize=2,
                  memsize='3G',
                  inputs_def=None):
         self._dataset = dataset
diff --git a/ppdet/data/tests/test_loader.py b/ppdet/data/tests/test_loader.py
index 9f373ad99018514b025901edc233a228e50e4a12..4ab31a8f344d44fa5373c3026eb316e71610b155 100644
--- a/ppdet/data/tests/test_loader.py
+++ b/ppdet/data/tests/test_loader.py
@@ -129,7 +129,7 @@ class TestReader(unittest.TestCase):
             drop_empty=True,
             worker_num=2,
             use_process=False,
-            bufsize=8,
+            bufsize=2,
             inputs_def=inputs_def)()
         for i in range(2):
             for samples in data_loader: