diff --git a/demo/mnist/api_train_v2.py b/demo/mnist/api_train_v2.py
index 6fc01ce58be57c77144c6558d039430b22d3a746..6b0cfa0b05c966cb86c133093bb5b3555b76d42a 100644
--- a/demo/mnist/api_train_v2.py
+++ b/demo/mnist/api_train_v2.py
@@ -27,19 +27,14 @@ def main():
     cost = paddle.layer.classification_cost(input=inference, label=label)
 
     parameters = paddle.parameters.create(cost)
-    for param_name in parameters.keys():
-        array = parameters.get(param_name)
-        array[:] = numpy.random.uniform(low=-1.0, high=1.0, size=array.shape)
-        parameters.set(parameter_name=param_name, value=array)
 
     adam_optimizer = paddle.optimizer.Adam(learning_rate=0.01)
 
     def event_handler(event):
         if isinstance(event, paddle.event.EndIteration):
-            para = parameters.get('___fc_2__.w0')
-            print "Pass %d, Batch %d, Cost %f, Weight Mean Of Fc 2 is %f" % (
-                event.pass_id, event.batch_id, event.cost, para.mean())
-
+            if event.batch_id % 100 == 0:
+                print "Pass %d, Batch %d, Cost %f, %s" % (
+                    event.pass_id, event.batch_id, event.cost, event.metrics)
         else:
             pass
 
@@ -49,7 +44,8 @@ def main():
                   topology=cost,
                   parameters=parameters,
                   event_handler=event_handler,
-                  batch_size=32,  # batch size should be refactor in Data reader
+                  num_passes=100,
+                  batch_size=200, # batch size should be refactor in Data reader
                   data_types={  # data_types will be removed, It should be in
                       # network topology
                       'pixel': images.type,
diff --git a/python/paddle/v2/event.py b/python/paddle/v2/event.py
index a16cfa91f062a60a141ea8fa962b3ecf6f5f0a22..835e28e6218df22e1cad7f7bb31c3c9941657252 100644
--- a/python/paddle/v2/event.py
+++ b/python/paddle/v2/event.py
@@ -3,8 +3,6 @@ All training events.
 
 There are:
 
-* BeginTraining
-* EndTraining
 * BeginIteration
 * EndIteration
 * BeginPass
@@ -12,15 +10,62 @@ There are:
 
 TODO(yuyang18): Complete it!
 """
-__all__ = ['EndIteration']
+import py_paddle.swig_paddle as api
+__all__ = ['EndIteration', 'BeginIteration', 'BeginPass', 'EndPass']
 
 
-class EndIteration(object):
+class WithMetric(object):
+    def __init__(self, evaluator):
+        if not isinstance(evaluator, api.Evaluator):
+            raise TypeError("Evaluator should be api.Evaluator type")
+        self.__evaluator__ = evaluator
+
+    @property
+    def metrics(self):
+        names = self.__evaluator__.getNames()
+        retv = dict()
+        for each_name in names:
+            val = self.__evaluator__.getValue(each_name)
+            retv[each_name] = val
+        return retv
+
+
+class BeginPass(object):
+    """
+    Event On One Pass Training Start.
+    """
+
+    def __init__(self, pass_id):
+        self.pass_id = pass_id
+
+
+class EndPass(WithMetric):
+    """
+    Event On One Pass Training Complete.
+    """
+
+    def __init__(self, pass_id, evaluator):
+        self.pass_id = pass_id
+        WithMetric.__init__(self, evaluator)
+
+
+class BeginIteration(object):
+    """
+    Event On One Batch Training Start.
+    """
+
+    def __init__(self, pass_id, batch_id):
+        self.pass_id = pass_id
+        self.batch_id = batch_id
+
+
+class EndIteration(WithMetric):
     """
     Event On One Batch Training Complete.
     """
 
-    def __init__(self, pass_id, batch_id, cost):
+    def __init__(self, pass_id, batch_id, cost, evaluator):
         self.pass_id = pass_id
         self.batch_id = batch_id
         self.cost = cost
+        WithMetric.__init__(self, evaluator)
diff --git a/python/paddle/v2/trainer.py b/python/paddle/v2/trainer.py
index 4365bd41e7073bce4112e5813dbf1517856c06f5..0acfcee2cee9ee3edc623f67283c52060e9f893e 100644
--- a/python/paddle/v2/trainer.py
+++ b/python/paddle/v2/trainer.py
@@ -96,11 +96,15 @@ class SGD(ITrainer):
             topology, api.CREATE_MODE_NORMAL, self.__optimizer__.enable_types())
         assert isinstance(gm, api.GradientMachine)
         parameters.append_gradient_machine(gm)
-
+        gm.randParameters()
         updater = self.__optimizer__.create_local_updater()
         updater.init(gm)
 
         gm.start()
+        batch_evaluator = gm.makeEvaluator()
+        assert isinstance(batch_evaluator, api.Evaluator)
+        pass_evaluator = gm.makeEvaluator()
+        assert isinstance(pass_evaluator, api.Evaluator)
         out_args = api.Arguments.createArguments(0)
 
         data_types_lists = []
@@ -112,12 +116,20 @@ class SGD(ITrainer):
         converter = DataProviderConverter(input_types=data_types_lists)
 
         for pass_id in xrange(num_passes):
+            event_handler(v2_event.BeginPass(pass_id))
+            pass_evaluator.start()
             updater.startPass()
             for batch_id, data_batch in enumerate(
                     __data_reader_to_batch__(train_data_reader, batch_size,
                                              topology)):
+                batch_evaluator.start()
+                event_handler(
+                    v2_event.BeginIteration(
+                        pass_id=pass_id, batch_id=batch_id))
                 pass_type = updater.startBatch(len(data_batch))
                 gm.forwardBackward(converter(data_batch), out_args, pass_type)
+                gm.eval(pass_evaluator)
+                gm.eval(batch_evaluator)
                 for each_param in gm.getParameters():
                     updater.update(each_param)
                 # Get cost. We use numpy to calculate total cost for this batch.
@@ -125,11 +137,17 @@ class SGD(ITrainer):
                 cost_vec = cost_vec.copyToNumpyMat()
                 cost = cost_vec.sum() / len(data_batch)
                 updater.finishBatch(cost)
+                batch_evaluator.finish()
                 event_handler(
                     v2_event.EndIteration(
-                        pass_id=pass_id, batch_id=batch_id, cost=cost))
+                        pass_id=pass_id,
+                        batch_id=batch_id,
+                        cost=cost,
+                        evaluator=batch_evaluator))
 
             updater.finishPass()
+            pass_evaluator.finish()
+            event_handler(v2_event.EndPass(pass_id, evaluator=pass_evaluator))
         gm.finish()