diff --git a/README.md b/README.md
index 370d1c0..5a5153c 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@
 <dependency>
   <groupId>com.xkcoding.http</groupId>
   <artifactId>simple-http</artifactId>
-  <version>1.0</version>
+  <version>1.0.2</version>
 </dependency>
 ```
 
diff --git a/pom.xml b/pom.xml
index b902027..f78eedc 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
   <groupId>com.xkcoding.http</groupId>
   <artifactId>simple-http</artifactId>
-  <version>1.0.1</version>
+  <version>1.0.2</version>
 
   <name>${project.artifactId}</name>
   <url>https://github.com/xkcoding/simple-http</url>
diff --git a/src/main/java/com/xkcoding/http/constants/Constants.java b/src/main/java/com/xkcoding/http/constants/Constants.java
index 932afc1..7ec2705 100644
--- a/src/main/java/com/xkcoding/http/constants/Constants.java
+++ b/src/main/java/com/xkcoding/http/constants/Constants.java
@@ -57,4 +57,9 @@ public interface Constants {
 	 * 空字符串
 	 */
 	String EMPTY = "";
+
+	/**
+	 * User-Agent
+	 */
+	String USER_AGENT = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36 simple-http";
 }
diff --git a/src/main/java/com/xkcoding/http/support/httpclient/HttpClientImpl.java b/src/main/java/com/xkcoding/http/support/httpclient/HttpClientImpl.java
index d32b8cf..878ca98 100644
--- a/src/main/java/com/xkcoding/http/support/httpclient/HttpClientImpl.java
+++ b/src/main/java/com/xkcoding/http/support/httpclient/HttpClientImpl.java
@@ -22,6 +22,8 @@
 import com.xkcoding.http.support.HttpHeader;
 import com.xkcoding.http.util.MapUtil;
 import com.xkcoding.http.util.StringUtil;
+import org.apache.http.Header;
+import org.apache.http.HttpHeaders;
 import org.apache.http.NameValuePair;
 import org.apache.http.client.config.RequestConfig;
 import org.apache.http.client.entity.UrlEncodedFormEntity;
@@ -60,6 +62,7 @@ public HttpClientImpl(CloseableHttpClient httpClient) {
 	}
 
 	private String exec(HttpRequestBase request) {
+		this.addHeader(request);
 		// 设置超时时长
 		request.setConfig(RequestConfig.custom()
 			.setConnectTimeout(Constants.TIMEOUT)
@@ -83,6 +86,19 @@ private String exec(HttpRequestBase request) {
 		}
 	}
 
+	/**
+	 * 添加request header
+	 *
+	 * @param request HttpRequestBase
+	 */
+	private void addHeader(HttpRequestBase request) {
+		String ua = HttpHeaders.USER_AGENT;
+		Header[] headers = request.getHeaders(ua);
+		if (null == headers || headers.length == 0) {
+			request.addHeader(ua, Constants.USER_AGENT);
+		}
+	}
+
 	private boolean isSuccess(CloseableHttpResponse response) {
 		if (response == null) {
 			return false;
diff --git a/src/main/java/com/xkcoding/http/support/java11/HttpClientImpl.java b/src/main/java/com/xkcoding/http/support/java11/HttpClientImpl.java
index 7a97dd6..b37413b 100644
--- a/src/main/java/com/xkcoding/http/support/java11/HttpClientImpl.java
+++ b/src/main/java/com/xkcoding/http/support/java11/HttpClientImpl.java
@@ -22,6 +22,7 @@
 import com.xkcoding.http.support.HttpHeader;
 import com.xkcoding.http.util.MapUtil;
 import com.xkcoding.http.util.StringUtil;
+import org.apache.http.HttpHeaders;
 
 import java.io.IOException;
 import java.net.URI;
@@ -47,14 +48,25 @@ public HttpClientImpl(HttpClient client) {
 		this.client = client;
 	}
 
-	private String exec(HttpRequest request) {
+	private String exec(HttpRequest.Builder builder) {
+		this.addHeader(builder);
 		try {
+			HttpRequest request = builder.build();
 			return client.send(request, HttpResponse.BodyHandlers.ofString()).body();
 		} catch (IOException | InterruptedException e) {
 			throw new SimpleHttpException(e);
 		}
 	}
 
+	/**
+	 * 添加request header
+	 *
+	 * @param builder HttpRequest.Builder
+	 */
+	private void addHeader(HttpRequest.Builder builder) {
+		builder.header(HttpHeaders.USER_AGENT, Constants.USER_AGENT);
+	}
+
 	/**
 	 * GET 请求
 	 *
@@ -102,7 +114,7 @@ public String get(String url, Map<String, String> params, HttpHeader header, boo
 			MapUtil.forEach(header.getHeaders(), builder::header);
 		}
 
-		return exec(builder.build());
+		return exec(builder);
 	}
 
 	/**
@@ -154,7 +166,7 @@ public String post(String url, String data, HttpHeader header) {
 			MapUtil.forEach(header.getHeaders(), builder::header);
 		}
 
-		return this.exec(builder.build());
+		return this.exec(builder);
 	}
 
 	/**
diff --git a/src/main/java/com/xkcoding/http/support/okhttp3/OkHttp3Impl.java b/src/main/java/com/xkcoding/http/support/okhttp3/OkHttp3Impl.java
index bf87865..8ca8485 100644
--- a/src/main/java/com/xkcoding/http/support/okhttp3/OkHttp3Impl.java
+++ b/src/main/java/com/xkcoding/http/support/okhttp3/OkHttp3Impl.java
@@ -23,6 +23,7 @@
 import com.xkcoding.http.util.MapUtil;
 import com.xkcoding.http.util.StringUtil;
 import okhttp3.*;
+import org.apache.http.HttpHeaders;
 
 import java.io.IOException;
 import java.time.Duration;
@@ -37,8 +38,8 @@
  * @date Created in 2019/12/24 19:06
  */
 public class OkHttp3Impl implements Http {
-	private final OkHttpClient httpClient;
 	public static final MediaType CONTENT_TYPE_JSON = MediaType.get(Constants.CONTENT_TYPE_JSON);
+	private final OkHttpClient httpClient;
 
 
 	public OkHttp3Impl() {
@@ -53,7 +54,9 @@ public OkHttp3Impl(OkHttpClient httpClient) {
 		this.httpClient = httpClient;
 	}
 
-	private String exec(Request request) {
+	private String exec(Request.Builder requestBuilder) {
+		this.addHeader(requestBuilder);
+		Request request = requestBuilder.build();
 		try (Response response = httpClient.newCall(request).execute()) {
 			if (!response.isSuccessful()) {
 				throw new SimpleHttpException("Unexpected code " + response);
@@ -65,6 +68,15 @@ private String exec(Request request) {
 		}
 	}
 
+	/**
+	 * 添加request header
+	 *
+	 * @param builder Request.Builder
+	 */
+	private void addHeader(Request.Builder builder) {
+		builder.header(HttpHeaders.USER_AGENT, Constants.USER_AGENT);
+	}
+
 	/**
 	 * GET 请求
 	 *
@@ -112,9 +124,9 @@ public String get(String url, Map<String, String> params, HttpHeader header, boo
 		if (header != null) {
 			MapUtil.forEach(header.getHeaders(), requestBuilder::addHeader);
 		}
-		Request request = requestBuilder.get().build();
+		requestBuilder = requestBuilder.get();
 
-		return exec(request);
+		return exec(requestBuilder);
 	}
 
 	/**
@@ -159,9 +171,9 @@ public String post(String url, String data, HttpHeader header) {
 		if (header != null) {
 			MapUtil.forEach(header.getHeaders(), requestBuilder::addHeader);
 		}
-		Request request = requestBuilder.post(body).build();
+		requestBuilder = requestBuilder.post(body);
 
-		return exec(request);
+		return exec(requestBuilder);
 	}
 
 	/**
@@ -200,8 +212,8 @@ public String post(String url, Map<String, String> params, HttpHeader header, bo
 		if (header != null) {
 			MapUtil.forEach(header.getHeaders(), requestBuilder::addHeader);
 		}
-		Request request = requestBuilder.post(body).build();
+		requestBuilder = requestBuilder.post(body);
 
-		return exec(request);
+		return exec(requestBuilder);
 	}
 }