diff --git a/hutool-core/src/main/java/org/dromara/hutool/core/convert/ConvertUtil.java b/hutool-core/src/main/java/org/dromara/hutool/core/convert/ConvertUtil.java
index ba5d7cf24..c7a51d5df 100644
--- a/hutool-core/src/main/java/org/dromara/hutool/core/convert/ConvertUtil.java
+++ b/hutool-core/src/main/java/org/dromara/hutool/core/convert/ConvertUtil.java
@@ -892,7 +892,7 @@ public class ConvertUtil {
 	 * @param str     待转换的ASCII字符串
 	 * @param charset 编码
 	 * @return 16进制字符串
-	 * @see HexUtil#encodeStr(String, Charset)
+	 * @see HexUtil#encodeStr(CharSequence, Charset)
 	 */
 	public static String toHex(final String str, final Charset charset) {
 		return HexUtil.encodeStr(str, charset);
@@ -926,10 +926,10 @@ public class ConvertUtil {
 	 * @param hexStr  Byte字符串(Byte之间无分隔符 如:[616C6B])
 	 * @param charset 编码 {@link Charset}
 	 * @return 对应的字符串
-	 * @see HexUtil#decodeStr(String, Charset)
+	 * @see HexUtil#decodeStr(CharSequence, Charset)
 	 * @since 4.1.11
 	 */
-	public static String hexToStr(final String hexStr, final Charset charset) {
+	public static String hexToStr(final CharSequence hexStr, final Charset charset) {
 		return HexUtil.decodeStr(hexStr, charset);
 	}
 
@@ -938,9 +938,9 @@ public class ConvertUtil {
 	 *
 	 * @param strText 全角字符串
 	 * @return String 每个unicode之间无分隔符
-	 * @see UnicodeUtil#toUnicode(String)
+	 * @see UnicodeUtil#toUnicode(CharSequence)
 	 */
-	public static String strToUnicode(final String strText) {
+	public static String strToUnicode(final CharSequence strText) {
 		return UnicodeUtil.toUnicode(strText);
 	}
 
diff --git a/hutool-core/src/main/java/org/dromara/hutool/core/text/UnicodeUtil.java b/hutool-core/src/main/java/org/dromara/hutool/core/text/UnicodeUtil.java
index 8db081e56..fd74dbd31 100644
--- a/hutool-core/src/main/java/org/dromara/hutool/core/text/UnicodeUtil.java
+++ b/hutool-core/src/main/java/org/dromara/hutool/core/text/UnicodeUtil.java
@@ -98,7 +98,7 @@ public class UnicodeUtil {
 	 * @param str 被编码的字符串
 	 * @return Unicode字符串
 	 */
-	public static String toUnicode(final String str) {
+	public static String toUnicode(final CharSequence str) {
 		return toUnicode(str, true);
 	}
 
@@ -109,9 +109,9 @@ public class UnicodeUtil {
 	 * @param isSkipAscii 是否跳过ASCII字符（只跳过可见字符）
 	 * @return Unicode字符串
 	 */
-	public static String toUnicode(final String str, final boolean isSkipAscii) {
+	public static String toUnicode(final CharSequence str, final boolean isSkipAscii) {
 		if (StrUtil.isEmpty(str)) {
-			return str;
+			return StrUtil.toStringOrNull(str);
 		}
 
 		final int len = str.length();