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+# System Event Logging
+
+Provides system event logging APIs for system HAP applications.
+
+> **NOTE**<br>
+> - The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+> - The APIs of this module are system APIs and cannot be called by third-party applications.
+
+
+## Modules to Import
+
+```js
+import hiSysEvent from '@ohos.hiSysEvent';
+```
+
+## EventType
+
+Enumerates event types.
+
+**System capability**: SystemCapability.HiviewDFX.HiSysEvent
+
+| Name| Default Value| Description|
+| -------- | -------- | -------- |
+| FAULT | 1 | Error event.|
+| STATISTIC | 2 | Statistic event.|
+| SECURITY | 3 | Security event.|
+| BEHAVIOR | 4 | User behavior event.|
+
+## SysEventInfo
+
+Defines a system event.
+
+**System capability**: SystemCapability.HiviewDFX.HiSysEvent
+
+| Name| Type| Mandatory| Description|
+| -------- | -------- | -------- | -------- |
+| domain | string | Yes| Event domain.|
+| name | string | Yes| Event name.|
+| eventType | [EventType](#eventtype) | Yes| Event type.|
+| params | object | No| Event parameters.|
+
+
+## hiSysEvent.write
+
+write(info: SysEventInfo, callback: AsyncCallback&lt;void&gt;): void
+
+Writes event information to the event file. This API uses an asynchronous callback to return the result.
+
+**System capability**: SystemCapability.HiviewDFX.HiSysEvent
+
+**Parameters**
+
+| Name   | Type                     | Mandatory| Description                                                        |
+| --------- | ------------------------- | ---- | ------------------------------------------------------------ |
+| info | [SysEventInfo](#syseventinfo) | Yes| System event information.|
+| callback  | AsyncCallback&lt;void&gt; | Yes| Callback used to process the received return value.<br>- Value **0**: The event verification is successful, and the event will be written to the event file asynchronously. <br>- A value greater than **0**: Invalid parameters are present in the event, and the event will be written to the event file asynchronously after the invalid parameters are ignored.<br>- A value smaller than **0**: The event parameter verification fails, and the event will not be written to the event file.|
+
+**Example**
+
+```js
+import hiSysEvent from '@ohos.hiSysEvent';
+
+hiSysEvent.write({
+	domain: "RELIABILITY",
+	name: "STACK",
+	eventType: hiSysEvent.EventType.FAULT,
+	params: {
+		PID: 487,
+		UID: 103,
+		PACKAGE_NAME: "com.ohos.hisysevent.test",
+		PROCESS_NAME: "syseventservice",
+		MSG: "no msg."
+	}
+}, (err, val) => {
+    // do something here.
+})
+```
+
+
+## hiSysEvent.write
+
+write(info: SysEventInfo): Promise&lt;void&gt;
+
+Writes event information to the event file. This API uses a promise to return the result.
+
+**System capability**: SystemCapability.HiviewDFX.HiSysEvent
+
+**Parameters**
+
+| Name   | Type                   | Mandatory| Description|
+| --------- | ----------------------- | ---- | --------------- |
+| eventType | [EventType](#eventtype) | Yes  | Application event type.|
+
+**Return value**
+
+| Type               | Description                                                        |
+| ------------------- | ------------------------------------------------------------ |
+| Promise&lt;void&gt; | Promise used to return the result. Depending on whether event writing is successful, you can use the **then()** or **catch()** method to process the callback.|
+
+**Example**
+
+```js
+import hiSysEvent from '@ohos.hiSysEvent';
+
+hiSysEvent.write({
+	domain: "RELIABILITY",
+	name: "STACK",
+	eventType: hiSysEvent.EventType.FAULT,
+	params: {
+		PID: 487,
+		UID: 103,
+		PACKAGE_NAME: "com.ohos.hisysevent.test",
+		PROCESS_NAME: "syseventservice",
+		MSG: "no msg."
+	}
+}).then(
+	(val) => {
+	    // do something here.
+	}
+).catch(
+	(err) => {
+	    // do something here.
+	}
+)
+```
+
+## RuleType
+
+Enumerates matching rule types.
+
+**System capability**: SystemCapability.HiviewDFX.HiSysEvent
+
+| Name| Default Value| Description|
+| -------- | -------- | -------- |
+| WHOLE_WORD | 1 | Whole word matching.|
+| PREFIX | 2 | Prefix matching.|
+| REGULAR | 3 | Regular expression matching.|
+
+## WatchRule
+
+Defines rules for event subscription.
+
+**System capability**: SystemCapability.HiviewDFX.HiSysEvent
+
+| Name| Type| Mandatory| Description|
+| -------- | -------- | -------- | -------- |
+| domain | string | Yes| Event domain.|
+| name | string | Yes| Event name.|
+| tag | string | No| Event tag.|
+| ruleType | [RuleType](#ruletype) | Yes| Matching rule type.|
+
+## Watcher
+
+Defines a watcher for event subscription.
+
+**System capability**: SystemCapability.HiviewDFX.HiSysEvent
+
+| Name| Type| Mandatory| Description|
+| -------- | -------- | -------- | -------- |
+| rules | [WatchRule](#watchrule)[] | Yes| Array of matching rules for event subscription.|
+| onEvent | function | Yes| Callback for event subscription: (info: [SysEventInfo](#syseventinfo)) => void|
+| onServiceDied | function | Yes| Callback for disabling of event subscription: () => void|
+
+## hiSysEvent.addWatcher
+
+addWatcher(watcher: Watcher): number
+
+Adds a watcher for event subscription.
+
+**Required permission**: ohos.permission.READ_DFX_SYSEVENT
+
+**System capability**: SystemCapability.HiviewDFX.HiSysEvent
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| ------ | ----------------------------- | ---- | ------------------------ |
+| watcher | [Watcher](#watcher) | Yes| Watcher for event subscription.|
+
+**Return value**
+
+| Type   | Description|
+| ------- | -------------------------------------------------- |
+| number | Event subscription result.<br>- **0**: Event subscription is successful.<br>- A value smaller than **0**: Event subscription has failed.|
+
+**Example**
+
+```js
+import hiSysEvent from '@ohos.hiSysEvent';
+
+let watcher = {
+	rules: [{
+		domain: "RELIABILITY",
+		name: "STACK",
+		tag: "STABILITY",
+		ruleType: hiSysEvent.RuleType.WHOLE_WORD,
+	}],
+	onEvent: (info) => {
+	    // do something here.
+	},
+	onServiceDied: () => {
+	    // do something here.
+	}
+}
+let ret = hiSysEvent.addWatcher(watcher)
+```
+
+## hiSysEvent.removeWatcher
+
+removeWatcher(wathcer: Watcher): number
+
+Removes a watcher used for event subscription.
+
+**Required permission**: ohos.permission.READ_DFX_SYSEVENT
+
+**System capability**: SystemCapability.HiviewDFX.HiSysEvent
+
+**Parameters**
+
+| Name| Type | Mandatory| Description |
+| ------ | ------------- | ---- | ------------------------ |
+| watcher | [Watcher](#watcher) | Yes| Watcher for event subscription.|
+
+**Return value**
+
+| Type   | Description|
+| ------- | ----------------------------------------------------------- |
+| number | Result of removing the watcher.<br>- **0**: Removing the watcher is successful.<br>- A value smaller than **0**: Removing the watcher has failed.|
+
+**Example**
+
+```js
+import hiSysEvent from '@ohos.hiSysEvent';
+
+let watcher = {
+	rules: [{
+		domain: "RELIABILITY",
+		name: "STACK",
+		tag: "STABILITY",
+		ruleType: hiSysEvent.RuleType.WHOLE_WORD,
+	}],
+	onEvent: (info) => {
+	    // do something here.
+	},
+	onServiceDied: () => {
+	    // do something here.
+	}
+}
+let ret = hiSysEvent.addWatcher(watcher)
+hiSysEvent.removeWatcher(watcher)
+```
+
+## QueryArg
+
+Defines arguments for event query.
+
+**System capability**: SystemCapability.HiviewDFX.HiSysEvent
+
+| Name| Type| Mandatory| Description|
+| -------- | -------- | -------- | -------- |
+| beginTime | number | Yes| Start time (13-digit timestamp) for event query.|
+| endTime | number | Yes| End time (13-digit timestamp) for event query.|
+| maxEvents | number | Yes| Maximum number of events that can be queried.|
+
+## QueryRule 
+
+Defines rules for event query.
+
+**System capability**: SystemCapability.HiviewDFX.HiSysEvent
+
+| Name| Type| Mandatory| Description|
+| -------- | -------- | -------- | -------- |
+| domain | string | Yes| Event domain.|
+| names | string[] | Yes| Array of event names.|
+
+## Querier
+
+Defines an event query instance.
+
+**System capability**: SystemCapability.HiviewDFX.HiSysEvent
+
+| Name| Type| Mandatory| Description|
+| -------- | -------- | -------- | -------- |
+| onQuery | function | Yes| Callback of queried events: (infos: [SysEventInfo](#syseventinfo)[], seqs: number[]) => void|
+| onComplete | function | Yes| Callback of query result statistics: (reason: number, total: number) => void|
+
+## hiSysEvent.query
+
+query(queryArg: QueryArg, rules: QueryRule[], querier: Querier): number
+
+Queries system events.
+
+**Required permission**: ohos.permission.READ_DFX_SYSEVENT
+
+**System capability**: SystemCapability.HiviewDFX.HiSysEvent
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| ------ | ----------------------------- | ---- | ------------------------ |
+| queryArg | [QueryArg](#queryarg) | Yes  | Arguments for event query.|
+| rules | [QueryRule](#queryrule)[] | Yes  | Array of event query rules.|
+| querier | [Querier](#querier) | Yes  | Event query instance.|
+
+**Return value**
+
+| Type   | Description                                                       |
+| ------- | ----------------------------------------------------------- |
+| number | Event query result.<br>- **0**: Event query is successful.<br>- A value smaller than **0**: Event query has failed.|
+
+**Example**
+
+```js
+import hiSysEvent from '@ohos.hiSysEvent';
+
+hiSysEvent.write({
+	domain: "RELIABILITY",
+	name: "STACK",
+	eventType: hiSysEvent.EventType.FAULT,
+	params: {
+		PID: 487,
+		UID: 103,
+		PACKAGE_NAME: "com.ohos.hisysevent.test",
+		PROCESS_NAME: "syseventservice",
+		MSG: "no msg."
+	}
+}, (err, val) => {
+	// do something here.
+})
+hiSysEvent.query({
+	beginTime: -1,
+	endTime: -1,
+	maxEvents: 5,
+}, [{
+	domain: "RELIABILITY",
+	names: ["STACK"],
+}], {
+	onQuery: function (infos, seqs) {
+		// do something here.
+	},
+	onComplete: function(reason, total) {
+		// do something here.
+	}
+})
+```