diff --git a/mindspore/core/ops/primitive_c.h b/mindspore/core/ops/primitive_c.h
index 0334aa25fcf..cd6f2acfeb3 100644
--- a/mindspore/core/ops/primitive_c.h
+++ b/mindspore/core/ops/primitive_c.h
@@ -25,11 +25,22 @@
 #include "ir/value.h"
 namespace mindspore {
 namespace ops {
+/// \brief PrimitiveC defines the base class for end side operators.
 class MS_CORE_API PrimitiveC : public Primitive {
  public:
+  /// \brief Constructor for PrimitiveC.
+  ///
+  /// \param[in] name The name of the end side operator.
   explicit PrimitiveC(const std::string &name) : Primitive(name) {}
   MS_DECLARE_PARENT(PrimitiveC, Primitive);
+
+  /// \brief Destructor of PrimitiveC.
   ~PrimitiveC() = default;
+
+  /// \brief Derive the abstract of the PrimitiveC object.
+  ///
+  /// \param[in] abstract_list The abstract of the inputs of the PrimitiveC object.
+  /// \return The abstract of the PrimitiveC object.
   AbstractBasePtr Infer(const AbstractBasePtrList &abstract_list);
 
  protected:
@@ -37,11 +48,26 @@ class MS_CORE_API PrimitiveC : public Primitive {
 };
 
 using OpPrimCDefineFunc = std::function<std::shared_ptr<PrimitiveC>()>;
+/// \brief OpPrimCRegister defines the singleton to save the end side operators.
 class MS_CORE_API OpPrimCRegister {
  public:
+  /// \brief Destructor of OpPrimCRegister.
   ~OpPrimCRegister() {}
+
+  /// \brief Get the OpPrimCRegister singleton.
+  ///
+  /// \return The OpPrimCRegister singleton.
   static OpPrimCRegister &GetInstance();
+
+  /// \brief Get PrimCMap of the OpPrimCRegister singleton.
+  ///
+  /// \return The PrimCMap of the OpPrimCRegister singleton.
   std::map<std::string, OpPrimCDefineFunc> GetPrimCMap();
+
+  /// \brief Add an element into the PrimCMap of the OpPrimCRegister singleton.
+  ///
+  /// param[in] kname The name of the input end side operator.
+  /// param[in] fn The input end side operator.
   void SetPrimCMap(const std::string &kname, const OpPrimCDefineFunc &fn);
 
  private:
@@ -49,11 +75,18 @@ class MS_CORE_API OpPrimCRegister {
   std::map<std::string, OpPrimCDefineFunc> op_primc_fns_;
 };
 
+/// \brief OpPrimCRegisterHelper defines the helper class for the OpPrimCRegister singleton.
 class MS_CORE_API OpPrimCRegisterHelper {
  public:
+  /// \brief Constructor for OpPrimCRegisterHelper.
+  ///
+  /// param[in] kname The name of the input end side operator.
+  /// param[in] fn The input end side operator.
   OpPrimCRegisterHelper(const std::string &kname, const OpPrimCDefineFunc &fn) {
     OpPrimCRegister::GetInstance().SetPrimCMap(kname, fn);
   }
+
+  /// Destructor of OpPrimCRegisterHelper.
   ~OpPrimCRegisterHelper() = default;
 
  private: