diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2e468e953e..08cc1b2a5d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@
 * 【core】        NumberUtil增加toBytes和toInt方法
 * 【core】        XmlUtil增加format方法，支持缩进
 * 【http】         SoapRequest增加executeBody方法（issue#IRN6I@Gitee）
+* 【core】        调整XmlUtil.toStr方法对编码的逻辑
 
 ### Bug修复
 * 【core】        修复AnnotationUtil.getAnnotationValue获取对象错误问题（issue#271@Github）
diff --git a/hutool-core/src/main/java/cn/hutool/core/util/XmlUtil.java b/hutool-core/src/main/java/cn/hutool/core/util/XmlUtil.java
index 3b248e3132..2ab5dfca5a 100644
--- a/hutool-core/src/main/java/cn/hutool/core/util/XmlUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/util/XmlUtil.java
@@ -4,12 +4,12 @@
 import java.beans.XMLEncoder;
 import java.io.BufferedInputStream;
 import java.io.BufferedWriter;
-import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.Reader;
+import java.io.StringWriter;
 import java.io.Writer;
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -232,7 +232,7 @@ public static String toStr(Document doc) {
 	 * @since 3.0.9
 	 */
 	public static String toStr(Document doc, boolean isPretty) {
-		return toStr(doc, null, isPretty);
+		return toStr(doc, CharsetUtil.UTF_8, isPretty);
 	}
 
 	/**
@@ -246,13 +246,13 @@ public static String toStr(Document doc, boolean isPretty) {
 	 * @since 3.0.9
 	 */
 	public static String toStr(Document doc, String charset, boolean isPretty) {
-		final ByteArrayOutputStream out = new ByteArrayOutputStream();
+		final StringWriter writer = StrUtil.getWriter();
 		try {
-			write(doc, out, charset, isPretty ? INDENT_DEFAULT : 0);
+			write(doc, writer, charset, isPretty ? INDENT_DEFAULT : 0);
 		} catch (Exception e) {
 			throw new UtilException(e, "Trans xml document to string error!");
 		}
-		return out.toString();
+		return writer.toString();
 	}
 
 	/**
@@ -306,7 +306,7 @@ public static void toFile(Document doc, String path, String charset) {
 		BufferedWriter writer = null;
 		try {
 			writer = FileUtil.getWriter(path, charset, false);
-			write(doc, writer, INDENT_DEFAULT);
+			write(doc, writer, charset, INDENT_DEFAULT);
 		} finally {
 			IoUtil.close(writer);
 		}
@@ -317,11 +317,12 @@ public static void toFile(Document doc, String path, String charset) {
 	 * 
 	 * @param node {@link Node} XML文档节点或文档本身
 	 * @param writer 写出的Writer，Writer决定了输出XML的编码
+	 * @param charset 编码
 	 * @param indent 格式化输出中缩进量，小于1表示不格式化输出
 	 * @since 3.0.9
 	 */
-	public static void write(Node node, Writer writer, int indent) {
-		transform(new DOMSource(node), new StreamResult(writer), null, indent);
+	public static void write(Node node, Writer writer, String charset, int indent) {
+		transform(new DOMSource(node), new StreamResult(writer), charset, indent);
 	}
 
 	/**
diff --git a/hutool-core/src/test/java/cn/hutool/core/util/XmlUtilTest.java b/hutool-core/src/test/java/cn/hutool/core/util/XmlUtilTest.java
index 685fef69b1..7e2757bd89 100644
--- a/hutool-core/src/test/java/cn/hutool/core/util/XmlUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/util/XmlUtilTest.java
@@ -65,7 +65,7 @@ public void xpathTest() {
 		Object value = XmlUtil.getByXPath("//returnsms/message", docResult, XPathConstants.STRING);
 		Assert.assertEquals("ok", value);
 	}
-	
+
 	@Test
 	public void xmlToMapTest() {
 		String xml = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>"//
@@ -77,7 +77,7 @@ public void xmlToMapTest() {
 				+ "<successCounts>1</successCounts>"//
 				+ "</returnsms>";
 		Map<String, Object> map = XmlUtil.xmlToMap(xml);
-		
+
 		Assert.assertEquals(5, map.size());
 		Assert.assertEquals("Success", map.get("returnstatus"));
 		Assert.assertEquals("ok", map.get("message"));
@@ -88,7 +88,8 @@ public void xmlToMapTest() {
 
 	@Test
 	public void mapToXmlTest() {
-		Map<String, Object> map = MapBuilder.create(new LinkedHashMap<String, Object>()).put("name", "张三")//
+		Map<String, Object> map = MapBuilder.create(new LinkedHashMap<String, Object>())//
+				.put("name", "张三")//
 				.put("age", 12)//
 				.put("game", MapUtil.builder(new LinkedHashMap<String, Object>()).put("昵称", "Looly").put("level", 14).build())//
 				.build();
@@ -105,7 +106,7 @@ public void mapToXmlTest() {
 				+ "</user>", //
 				XmlUtil.toStr(doc, false));
 	}
-	
+
 	@Test
 	public void readTest() {
 		Document doc = XmlUtil.readXML("test.xml");