diff --git a/base/include/common_errors.h b/base/include/common_errors.h
index 2758bff1206c74ea32a6c4eb6d99c5526ef3e513..2f63ee4a4c16d8142d9379a6ef2d403f968569fd 100644
--- a/base/include/common_errors.h
+++ b/base/include/common_errors.h
@@ -13,6 +13,13 @@
  * limitations under the License.
  */
 
+ /**
+  * @file common_errors.h
+  *
+  * @brief Provide value of 'Module' segment of ErrCode for all modules in
+  * commonlibrary subsystem.
+  */
+
 #ifndef UTILS_COMMON_ERRORS_H
 #define UTILS_COMMON_ERRORS_H
 
@@ -31,6 +38,13 @@ namespace Utils {
  * In this file, subsystem is "SUBSYS_COMMON".
  */
 
+/**
+ * @brief Value of 'Module' segment of ErrCode for modules in commonlibrary
+ * subsystem.
+ *
+ * @var MODULE_DEFAULT Default
+ * @var MODULE_TIMER Timer(timer.h)
+ */
 enum {
     MODULE_DEFAULT              = 0,
     MODULE_TIMER                = 1
diff --git a/base/include/common_timer_errors.h b/base/include/common_timer_errors.h
index 2d244af20054dfb902e50c3089e3638d9268ea52..9c90ccd1a428d73cf6807f259e6c4f6b4d1390ac 100644
--- a/base/include/common_timer_errors.h
+++ b/base/include/common_timer_errors.h
@@ -13,6 +13,13 @@
  * limitations under the License.
  */
 
+ /**
+  * @file common_timer_errors.h
+  *
+  * @brief Provide value of 'Code' segment of ErrCode for 'Timer' module in
+  * commonlibrary subsystem.
+  */
+
 #ifndef UTILS_COMMON_TIMER_ERRORS_H
 #define UTILS_COMMON_TIMER_ERRORS_H
 
@@ -38,8 +45,19 @@ namespace Utils {
 using ErrCode = int;
 
 // offset of timer module error, only be used in this file.
+/**
+ * @brief Base ErrCode of module 'Timer' in commonlibrary subsystem.
+ */
 constexpr ErrCode COMMON_TIMER_ERR_OFFSET = ErrCodeOffset(SUBSYS_COMMON, MODULE_TIMER);
 
+/**
+ * @brief Value of 'Code' segment of ErrCode for 'Timer'.
+ *
+ * @var TIMER_ERR_OK Success.
+ * @var TIMER_ERR_DEAL_FAILED Deal failed.
+ * @var TIMER_ERR_BADF Bad file descriptor.
+ * @var TIMER_ERR_INVALID_VALUE Invalid value.
+ */
 enum {
     TIMER_ERR_OK                = 0,
     TIMER_ERR_DEAL_FAILED       = COMMON_TIMER_ERR_OFFSET + EAGAIN,
diff --git a/base/include/errors.h b/base/include/errors.h
index 9dadfa0d189478765378994399f4b94f1f903f11..56f61fc2508a108a107a18b9a08080ecd4c3e270 100644
--- a/base/include/errors.h
+++ b/base/include/errors.h
@@ -13,6 +13,12 @@
  * limitations under the License.
  */
 
+ /**
+  * @file errors.h
+  *
+  * @brief Provide format of error code in OpenHarmony.
+  */
+
 #ifndef UTILS_BASE_ERRORS_H
 #define UTILS_BASE_ERRORS_H
 
@@ -32,6 +38,9 @@ namespace OHOS {
 
 using ErrCode = int;
 
+/**
+ * @brief Value of 'Subsystem' segment of ErrCode for every subsystem.
+ */
 enum {
     SUBSYS_COMMON                = 0,
     SUBSYS_AAFWK                 = 1,
@@ -87,6 +96,15 @@ enum {
 };
 
 // be used to init the subsystem errorno.
+/**
+ * @brief Generate base error code for a specified module in specified
+ * subsystem.
+ *
+ * @param subsystem Value of 'Subsystem' segment.
+ * @param module Value of 'Module' segment,
+ * which is 0 by default.
+ * @return Return base ErrCode for specified module.
+ */
 constexpr ErrCode ErrCodeOffset(unsigned int subsystem, unsigned int module = 0)
 {
     constexpr int SUBSYSTEM_BIT_NUM = 21;
@@ -95,8 +113,18 @@ constexpr ErrCode ErrCodeOffset(unsigned int subsystem, unsigned int module = 0)
 }
 
 // offset of common error, only be used in this file.
+/**
+ * @brief Base ErrCode of common(valid for all modules)
+ * in commonlibrary subsystem.
+ */
 constexpr ErrCode BASE_ERR_OFFSET = ErrCodeOffset(SUBSYS_COMMON);
 
+/**
+ * @brief Value of common 'Code' segment of ErrCode
+ * in commonlibrary subsystem.
+ *
+ * @see Related error codes defined in errno.h
+ */
 enum {
     ERR_OK                = 0,
     ERR_NO_MEMORY         = BASE_ERR_OFFSET + ENOMEM,