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diff --git a/en/device-dev/kernel/kernel-small-basic-time.md b/en/device-dev/kernel/kernel-small-basic-time.md
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--- a/en/device-dev/kernel/kernel-small-basic-time.md
+++ b/en/device-dev/kernel/kernel-small-basic-time.md
@@ -1,7 +1,7 @@
 # Time Management
 
 
-## Basic Concepts<a name="section12903185785119"></a>
+## Basic Concepts
 
 Time management provides all time-related services for applications based on the system clock. The system clock is generated by the interrupts triggered by the output pulse of a timer or counter. The system clock is generally defined as an integer or a long integer. The period of an output pulse is a "clock tick". The system clock is also called time scale or tick. The duration of a tick can be configured statically. People use second or millisecond as the time unit, while the operating system uses tick. When operations such as suspending a task or delaying a task are performed, the time management module converts time between ticks and seconds or milliseconds.
 
@@ -19,11 +19,11 @@ The mapping between ticks and seconds can be configured.
 
 The OpenHarmony time management module provides time conversion, statistics, and delay functions to meet users' time requirements.
 
-## Development Guidelines<a name="section430981720522"></a>
+## Development Guidelines
 
 The time management module provides APIs to implement conversion between the system running time, ticks, and seconds/milliseconds.
 
-### Available APIs<a name="section1040142705214"></a>
+### Available APIs
 
 The following table describes APIs available for the OpenHarmony LiteOS-A time management. For more details about the APIs, see the API reference.
 
@@ -65,7 +65,7 @@ The following table describes APIs available for the OpenHarmony LiteOS-A time m
 </tbody>
 </table>
 
-### How to Develop<a name="section1381224710522"></a>
+### How to Develop
 
 1.  Call APIs to convert time.
 2.  Call APIs to perform time statistics.
@@ -75,12 +75,13 @@ The following table describes APIs available for the OpenHarmony LiteOS-A time m
 >-   The time management module depends on  **OS\_SYS\_CLOCK**  and  **LOSCFG\_BASE\_CORE\_TICK\_PER\_SECOND**  in  **los\_config.h**.
 >-   The number of system ticks is not counted when the interrupt feature is disabled. Therefore, the number of ticks cannot be used as the accurate time.
 
-### Development Example<a name="section1344610245416"></a>
+### Development Example
 
-Prerequisites:
+**Prerequisites**
+The following parameters are configured: 
 
--   **LOSCFG\_BASE\_CORE\_TICK\_PER\_SECOND**, that is, the number of ticks per second in the system, is configured.
--   **OS\_SYS\_CLOCK**, that is, system clock \(in Hz\), is configured.
+-   **LOSCFG\_BASE\_CORE\_TICK\_PER\_SECOND**: number of ticks per second in the system. The value range is (0, 1000].
+-   **OS\_SYS\_CLOCK**: system clock, in Hz.
 
 **Sample Code**