diff --git a/hutool-core/src/main/java/cn/hutool/core/util/CoordinateUtil.java b/hutool-core/src/main/java/cn/hutool/core/util/CoordinateUtil.java
index 826d711eb..7f7624bef 100644
--- a/hutool-core/src/main/java/cn/hutool/core/util/CoordinateUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/util/CoordinateUtil.java
@@ -22,12 +22,12 @@ public class CoordinateUtil {
 	/**
 	 * 坐标转换参数：(火星坐标系与百度坐标系转换的中间量)
 	 */
-	public static final double X_PI = 3.14159265358979324 * 3000.0 / 180.0;
+	public static final double X_PI = 3.1415926535897932384626433832795 * 3000.0 / 180.0;
 
 	/**
 	 * 坐标转换参数：π
 	 */
-	public static final double PI = 3.1415926535897932384626D;
+	public static final double PI = 3.1415926535897932384626433832795D;
 
 	/**
 	 * 地球半径（Krasovsky 1940）
@@ -167,7 +167,7 @@ public class CoordinateUtil {
 		dlng = (dlng * 180.0) / (RADIUS / sqrtMagic * Math.cos(lat / 180.0 * PI) * PI);
 		dlat = (dlat * 180.0) / ((RADIUS * (1 - CORRECTION_PARAM)) / (magic * sqrtMagic) * PI);
 
-		if(false == isPlus){
+		if(!isPlus){
 			dlng = - dlng;
 			dlat = - dlat;
 		}
@@ -280,7 +280,7 @@ public class CoordinateUtil {
 		 */
 		public Coordinate offset(Coordinate offset){
 			this.lng += offset.lng;
-			this.lat += offset.lng;
+			this.lat += offset.lat;
 			return this;
 		}
 
diff --git a/hutool-core/src/test/java/cn/hutool/core/util/CoordinateUtilTest.java b/hutool-core/src/test/java/cn/hutool/core/util/CoordinateUtilTest.java
index a2f141e39..b3c081546 100644
--- a/hutool-core/src/test/java/cn/hutool/core/util/CoordinateUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/util/CoordinateUtilTest.java
@@ -11,37 +11,46 @@ import org.junit.Test;
  */
 public class CoordinateUtilTest {
 
+	@Test
+	public void wgs84ToGcj02Test(){
+		final CoordinateUtil.Coordinate coordinate = CoordinateUtil.wgs84ToGcj02(116.404, 39.915);
+		Assert.assertEquals(116.41033392216508D, coordinate.getLng(), 15);
+		Assert.assertEquals(39.91640428150164D, coordinate.getLat(), 15);
+	}
+
+	@Test
+	public void gcj02ToWgs84Test(){
+		final CoordinateUtil.Coordinate coordinate = CoordinateUtil.gcj02ToWgs84(116.404, 39.915);
+		Assert.assertEquals(116.39766607783491D, coordinate.getLng(), 15);
+		Assert.assertEquals(39.91359571849836D, coordinate.getLat(), 15);
+	}
+
+	@Test
+	public void wgs84toBd09Test(){
+		final CoordinateUtil.Coordinate coordinate = CoordinateUtil.wgs84ToBd09(116.404, 39.915);
+		Assert.assertEquals(116.41671695444782D, coordinate.getLng(), 15);
+		Assert.assertEquals(39.922698713521726D, coordinate.getLat(), 15);
+	}
+
+	@Test
+	public void bd09toWgs84Test(){
+		final CoordinateUtil.Coordinate coordinate = CoordinateUtil.bd09toWgs84(116.404, 39.915);
+		Assert.assertEquals(116.39129143419822D, coordinate.getLng(), 15);
+		Assert.assertEquals(39.907253214522164D, coordinate.getLat(), 15);
+	}
+
 	@Test
 	public void gcj02ToBd09Test() {
-		final CoordinateUtil.Coordinate gcj02 = CoordinateUtil.gcj02ToBd09(116.404, 39.915);
-		Assert.assertEquals(116.41036949371029D, gcj02.getLng(), 15);
-		Assert.assertEquals(39.92133699351021D, gcj02.getLat(), 15);
+		final CoordinateUtil.Coordinate coordinate = CoordinateUtil.gcj02ToBd09(116.404, 39.915);
+		Assert.assertEquals(116.41036949371029D, coordinate.getLng(), 15);
+		Assert.assertEquals(39.92133699351022D, coordinate.getLat(), 15);
 	}
 
 	@Test
 	public void bd09toGcj02Test(){
-		final CoordinateUtil.Coordinate gcj02 = CoordinateUtil.bd09ToGcj02(116.404, 39.915);
-		Assert.assertEquals(116.39762729119315D, gcj02.getLng(), 15);
-		Assert.assertEquals(39.90865673957631D, gcj02.getLat(), 15);
-	}
-
-	@Test
-	public void gcj02ToWgs84(){
-		final CoordinateUtil.Coordinate gcj02 = CoordinateUtil.wgs84ToGcj02(116.404, 39.915);
-		Assert.assertEquals(116.39775550083061D, gcj02.getLng(), 15);
-		Assert.assertEquals(39.91359571849836D, gcj02.getLat(), 15);
-	}
-
-	@Test
-	public void wgs84ToGcj02Test(){
-		final CoordinateUtil.Coordinate gcj02 = CoordinateUtil.wgs84ToGcj02(116.404, 39.915);
-		Assert.assertEquals(116.41024449916938D, gcj02.getLng(), 15);
-		Assert.assertEquals(39.91640428150164D, gcj02.getLat(), 15);
-	}
-
-	@Test
-	public void wgs84toBd09(){
-
+		final CoordinateUtil.Coordinate coordinate = CoordinateUtil.bd09ToGcj02(116.404, 39.915);
+		Assert.assertEquals(116.39762729119315D, coordinate.getLng(), 15);
+		Assert.assertEquals(39.90865673957631D, coordinate.getLat(), 15);
 	}
 
 }