diff --git a/paddle/fluid/operators/activation_op.cc b/paddle/fluid/operators/activation_op.cc
index 979115eee0dbe157dbcf2293d914cc250b35d22e..a6d9ce0f041b859ecf6b3de902a9d1f132a4c76e 100644
--- a/paddle/fluid/operators/activation_op.cc
+++ b/paddle/fluid/operators/activation_op.cc
@@ -260,6 +260,36 @@ $out = floor(x)$
   }
 };
 
+class CosOpMaker : public framework::OpProtoAndCheckerMaker {
+ public:
+  CosOpMaker(OpProto *proto, OpAttrChecker *op_checker)
+      : framework::OpProtoAndCheckerMaker(proto, op_checker) {
+    AddInput("X", "Input of Cosine operator");
+    AddOutput("Out", "Output of Cosine operator");
+    AddComment(R"DOC(
+Cosine Activation Operator.
+
+$out = cos(x)$
+
+)DOC");
+  }
+};
+
+class SinOpMaker : public framework::OpProtoAndCheckerMaker {
+ public:
+  SinOpMaker(OpProto *proto, OpAttrChecker *op_checker)
+      : framework::OpProtoAndCheckerMaker(proto, op_checker) {
+    AddInput("X", "Input of Sine operator");
+    AddOutput("Out", "Output of Sine operator");
+    AddComment(R"DOC(
+Sine Activation Operator.
+
+$out = sin(x)$
+
+)DOC");
+  }
+};
+
 class RoundOpMaker : public framework::OpProtoAndCheckerMaker {
  public:
   RoundOpMaker(OpProto *proto, OpAttrChecker *op_checker)
@@ -561,6 +591,12 @@ REGISTER_OP(ceil, ops::ActivationOp, ops::CeilOpMaker, ceil_grad,
 REGISTER_OP(floor, ops::ActivationOp, ops::FloorOpMaker, floor_grad,
             ops::ActivationOpGrad);
 
+REGISTER_OP(cos, ops::ActivationOp, ops::CosOpMaker, cos_grad,
+            ops::ActivationOpGrad);
+
+REGISTER_OP(sin, ops::ActivationOp, ops::SinOpMaker, sin_grad,
+            ops::ActivationOpGrad);
+
 REGISTER_OP(round, ops::ActivationOp, ops::RoundOpMaker, round_grad,
             ops::ActivationOpGrad);
 
diff --git a/paddle/fluid/operators/activation_op.h b/paddle/fluid/operators/activation_op.h
index 4c575b4a7b551be2d1288f7fec0a2821fc10c40d..7fbe4efc045b6539b498389af94769e5bdb1f82e 100644
--- a/paddle/fluid/operators/activation_op.h
+++ b/paddle/fluid/operators/activation_op.h
@@ -331,6 +331,54 @@ struct FloorFunctor : public BaseActivationFunctor<T> {
   }
 };
 
+template <typename T>
+struct Sine {
+  HOSTDEVICE T operator()(const T& val) const { return sin(val); }
+};
+
+template <typename T>
+struct Cosine {
+  HOSTDEVICE T operator()(const T& val) const { return cos(val); }
+};
+
+// cosine'(x) = -sin(x)
+template <typename T>
+struct CosGradFunctor : public BaseActivationFunctor<T> {
+  template <typename Device, typename X, typename Out, typename dOut,
+            typename dX>
+  void operator()(Device d, X x, Out out, dOut dout, dX dx) const {
+    dx.device(d) = -dout * x.unaryExpr(Sine<T>());
+  }
+};
+
+// cosine(x) = cos(x)
+template <typename T>
+struct CosFunctor : public BaseActivationFunctor<T> {
+  template <typename Device, typename X, typename Out>
+  void operator()(Device d, X x, Out out) const {
+    out.device(d) = x.unaryExpr(Cosine<T>());
+  }
+};
+
+// sine'(x) = cos(x)
+template <typename T>
+struct SinGradFunctor : public BaseActivationFunctor<T> {
+  template <typename Device, typename X, typename Out, typename dOut,
+            typename dX>
+  void operator()(Device d, X x, Out out, dOut dout, dX dx) const {
+    dx.device(d) = dout * x.unaryExpr(Cosine<T>());
+  }
+};
+
+// sine(x) = sin(x)
+template <typename T>
+struct SinFunctor : public BaseActivationFunctor<T> {
+  template <typename Device, typename X, typename Out>
+  void operator()(Device d, X x, Out out) const {
+    out.device(d) = x.unaryExpr(Sine<T>());
+  }
+};
+
 // round(x) = [x]
 template <typename T>
 struct RoundFunctor : public BaseActivationFunctor<T> {
@@ -782,6 +830,8 @@ struct SwishGradFunctor : public BaseActivationFunctor<T> {
   __macro(abs, AbsFunctor, AbsGradFunctor);                          \
   __macro(ceil, CeilFunctor, ZeroGradFunctor);                       \
   __macro(floor, FloorFunctor, ZeroGradFunctor);                     \
+  __macro(cos, CosFunctor, CosGradFunctor);                          \
+  __macro(sin, SinFunctor, SinGradFunctor);                          \
   __macro(round, RoundFunctor, ZeroGradFunctor);                     \
   __macro(reciprocal, ReciprocalFunctor, ReciprocalGradFunctor);     \
   __macro(log, LogFunctor, LogGradFunctor);                          \
diff --git a/python/paddle/fluid/layers/ops.py b/python/paddle/fluid/layers/ops.py
index f5c6b47d243dcf4ba985cfb41fc23b44d3ed809f..0e5987ee598158d189db8bc956b7e7fea2517554 100644
--- a/python/paddle/fluid/layers/ops.py
+++ b/python/paddle/fluid/layers/ops.py
@@ -25,6 +25,8 @@ __activations__ = [
     'abs',
     'ceil',
     'floor',
+    'cos',
+    'sin',
     'round',
     'reciprocal',
     'log',
diff --git a/python/paddle/fluid/tests/unittests/test_activation_op.py b/python/paddle/fluid/tests/unittests/test_activation_op.py
index 4a2b35322dd4b9718c83eb5ee679ada382938441..fb162f8b7315936824ad40aca0c99e4dd09f9734 100644
--- a/python/paddle/fluid/tests/unittests/test_activation_op.py
+++ b/python/paddle/fluid/tests/unittests/test_activation_op.py
@@ -196,6 +196,34 @@ class TestFloor(OpTest):
         self.check_grad(['X'], 'Out', max_relative_error=0.007)
 
 
+class TestCos(OpTest):
+    def setUp(self):
+        self.op_type = "cos"
+        x = np.random.uniform(-1, 1, [4, 4]).astype("float32")
+        self.inputs = {'X': x}
+        self.outputs = {'Out': np.cos(self.inputs['X'])}
+
+    def test_check_output(self):
+        self.check_output()
+
+    def test_check_grad(self):
+        self.check_grad(['X'], 'Out', max_relative_error=0.007)
+
+
+class TestSin(OpTest):
+    def setUp(self):
+        self.op_type = "sin"
+        x = np.random.uniform(-1, 1, [4, 4]).astype("float32")
+        self.inputs = {'X': x}
+        self.outputs = {'Out': np.sin(self.inputs['X'])}
+
+    def test_check_output(self):
+        self.check_output()
+
+    def test_check_grad(self):
+        self.check_grad(['X'], 'Out', max_relative_error=0.007)
+
+
 class TestRound(OpTest):
     def setUp(self):
         self.op_type = "round"