diff --git a/python/paddle/fluid/inferencer.py b/python/paddle/fluid/inferencer.py
index 894f6dbfadcaf532556c439daf2c3b4ca24ffeb4..9f242cf29a56573349f192307a68e135a409a4be 100644
--- a/python/paddle/fluid/inferencer.py
+++ b/python/paddle/fluid/inferencer.py
@@ -56,7 +56,7 @@ class Inferencer(object):
         else:
             self.exe = executor.Executor(self.place)
 
-    def infer(self, inputs):
+    def infer(self, inputs, return_numpy=True):
         """
         :param inputs: a map of {"input_name": input_var} that will be feed into the inference program
         to get the predict value
@@ -66,9 +66,11 @@ class Inferencer(object):
             raise ValueError(
                 "inputs should be a map of {'input_name': input_var}")
 
-        with self._prog_and_scope_guard():
-            results = self.exe.run(feed=inputs,
-                                   fetch_list=[self.predict_var.name])
+        with executor.scope_guard(self.scope):
+            results = self.exe.run(self.inference_program,
+                                   feed=inputs,
+                                   fetch_list=[self.predict_var],
+                                   return_numpy=return_numpy)
 
         return results
 
diff --git a/python/paddle/fluid/tests/book/high-level-api/fit_a_line/test_fit_a_line.py b/python/paddle/fluid/tests/book/high-level-api/fit_a_line/test_fit_a_line.py
index 4c8505acf322a8ee33799c009b523cd70bd01db3..5fba561e024b0690f10939267146f2622c567fa5 100644
--- a/python/paddle/fluid/tests/book/high-level-api/fit_a_line/test_fit_a_line.py
+++ b/python/paddle/fluid/tests/book/high-level-api/fit_a_line/test_fit_a_line.py
@@ -92,7 +92,7 @@ def infer(use_cuda, inference_program, save_dirname=None):
     tensor_x = numpy.random.uniform(0, 10, [batch_size, 13]).astype("float32")
 
     results = inferencer.infer({'x': tensor_x})
-    print("infer results: ", numpy.array(results[0]))
+    print("infer results: ", results[0])
 
 
 def main(use_cuda):
diff --git a/python/paddle/fluid/tests/book/high-level-api/recognize_digits/test_recognize_digits_conv.py b/python/paddle/fluid/tests/book/high-level-api/recognize_digits/test_recognize_digits_conv.py
index 2128d4c5b87434ebe30930dc0e338b3b50d921c2..2aac70463c64019ec97b0c3893b4b52f77967797 100644
--- a/python/paddle/fluid/tests/book/high-level-api/recognize_digits/test_recognize_digits_conv.py
+++ b/python/paddle/fluid/tests/book/high-level-api/recognize_digits/test_recognize_digits_conv.py
@@ -112,7 +112,7 @@ def infer(use_cuda, inference_program, save_dirname=None):
 
     results = inferencer.infer({'img': tensor_img})
 
-    print("infer results: ", numpy.array(results[0]))
+    print("infer results: ", results[0])
 
 
 def main(use_cuda):
diff --git a/python/paddle/fluid/tests/book/high-level-api/recognize_digits/test_recognize_digits_mlp.py b/python/paddle/fluid/tests/book/high-level-api/recognize_digits/test_recognize_digits_mlp.py
index 041c8d778e5c03aa68dad6ef450934f09c8d2a52..32653157994f81c46f420c1b55ceddbbbf06f2fe 100644
--- a/python/paddle/fluid/tests/book/high-level-api/recognize_digits/test_recognize_digits_mlp.py
+++ b/python/paddle/fluid/tests/book/high-level-api/recognize_digits/test_recognize_digits_mlp.py
@@ -93,7 +93,7 @@ def infer(use_cuda, inference_program, save_dirname=None):
 
     results = inferencer.infer({'img': tensor_img})
 
-    print("infer results: ", numpy.array(results[0]))
+    print("infer results: ", results[0])
 
 
 def main(use_cuda):