diff --git a/hutool-core/src/main/java/cn/hutool/core/lang/ansi/AnsiColorWrapper.java b/hutool-core/src/main/java/cn/hutool/core/lang/ansi/AnsiColorWrapper.java
index dd197035e..b926c29ff 100644
--- a/hutool-core/src/main/java/cn/hutool/core/lang/ansi/AnsiColorWrapper.java
+++ b/hutool-core/src/main/java/cn/hutool/core/lang/ansi/AnsiColorWrapper.java
@@ -1,6 +1,7 @@
 package cn.hutool.core.lang.ansi;
 
 import cn.hutool.core.lang.Assert;
+import cn.hutool.core.util.StrUtil;
 
 import java.util.Objects;
 
@@ -39,9 +40,19 @@ public class AnsiColorWrapper {
 	public AnsiElement toAnsiElement(ForeOrBack foreOrBack){
 		if (bitDepth== AnsiColors.BitDepth.FOUR){
 			if (foreOrBack == ForeOrBack.FORE){
-				return AnsiColor.valueOf(String.valueOf(code));
+				for (AnsiColor item : AnsiColor.values()) {
+					if (StrUtil.equals(item.toString(), StrUtil.toString(code))) {
+						return item;
+					}
+				}
+				throw new IllegalArgumentException(StrUtil.format("No matched AnsiColor instance,code={}",code));
 			}
-			return AnsiBackground.valueOf(String.valueOf(code + 10));
+			for (AnsiBackground item : AnsiBackground.values()) {
+				if (StrUtil.equals(item.toString(), StrUtil.toString(code+10))) {
+					return item;
+				}
+			}
+			throw new IllegalArgumentException(StrUtil.format("No matched Background instance,code=",code));
 		}
 		if (foreOrBack == ForeOrBack.FORE){
 			return Ansi8BitColor.foreground(code);
diff --git a/hutool-core/src/test/java/cn/hutool/core/lang/ansi/AnsiEncoderTest.java b/hutool-core/src/test/java/cn/hutool/core/lang/ansi/AnsiEncoderTest.java
index d5c9ef17e..91f6b7aeb 100755
--- a/hutool-core/src/test/java/cn/hutool/core/lang/ansi/AnsiEncoderTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/lang/ansi/AnsiEncoderTest.java
@@ -1,6 +1,7 @@
 package cn.hutool.core.lang.ansi;
 
 import cn.hutool.core.lang.Console;
+import cn.hutool.core.util.StrUtil;
 import org.junit.Assert;
 import org.junit.Ignore;
 import org.junit.Test;
@@ -37,4 +38,31 @@ public class AnsiEncoderTest {
 			//Console.print( i%2==1?encode+"\n":encode);
 		}
 	}
+
+	@Test
+	public void colorMappingTest(){
+		String text4 = "RGB:({},{},{})--4bit ";
+		String text8 = "RGB:({},{},{})--8bit ";
+		final AnsiColors ansiColors4Bit = new AnsiColors(AnsiColors.BitDepth.FOUR);
+		final AnsiColors ansiColors8Bit = new AnsiColors(AnsiColors.BitDepth.EIGHT);
+		int count = 0;
+		int from = 100000;
+		int until = 120000;
+		for (int r = 0; r < 256; r++) {
+			if (count>until)break;
+			for (int g = 0; g < 256; g++) {
+				if (count>until)break;
+				for (int b = 0; b < 256; b++) {
+					count++;
+					if (count<from)continue;
+					if (count>until)break;
+					AnsiElement backElement4bit = ansiColors4Bit.findClosest(new Color(r,g,b)).toAnsiElement(AnsiColorWrapper.ForeOrBack.BACK);
+					AnsiElement backElement8bit = ansiColors8Bit.findClosest(new Color(r,g,b)).toAnsiElement(AnsiColorWrapper.ForeOrBack.BACK);
+					String encode4 = AnsiEncoder.encode( backElement4bit,text4);
+					String encode8 = AnsiEncoder.encode( backElement8bit,text8);
+					//Console.log(StrUtil.format(encode4,r,g,b)+StrUtil.format(encode8,r,g,b));
+				}
+			}
+		}
+	}
 }