diff --git a/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/BaseComparablePropertyValidator.java b/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/BaseComparablePropertyValidator.java
index 4d3bad9..4e9a85c 100644
--- a/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/BaseComparablePropertyValidator.java
+++ b/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/BaseComparablePropertyValidator.java
@@ -33,7 +33,7 @@ import com.google.common.collect.Range;
  */
 public abstract class BaseComparablePropertyValidator<
             T,
-            TProperty extends Comparable<TProperty>,
+            TProperty extends Comparable<? super TProperty>,
             TPropertyValidator extends BaseComparablePropertyValidator<T, TProperty, TPropertyValidator>>
         extends BasePropertyValidator<T, TProperty, TPropertyValidator> {
 
@@ -47,9 +47,9 @@ public abstract class BaseComparablePropertyValidator<
      * @param range 区间
      * @return 当前校验器实例，用于链式调用
      */
-    public final TPropertyValidator inRange(final Range<TProperty> range) {
+    public final TPropertyValidator inRange(final Range<? super TProperty> range) {
         return withRule(Conditions.inRange(range), value -> ValidationException.withMessage(
-            "The input must in the interval %s. You entered %s.", range, value));
+                "The input must in the interval %s. You entered %s.", range, value));
     }
 
     /**
@@ -60,7 +60,7 @@ public abstract class BaseComparablePropertyValidator<
      * @return 当前校验器实例，用于链式调用
      */
     public final TPropertyValidator inRange(
-        final Range<TProperty> range, final String errorMessage) {
+            final Range<? super TProperty> range, final String errorMessage) {
         return withRule(Conditions.inRange(range), errorMessage);
     }
 
@@ -73,7 +73,7 @@ public abstract class BaseComparablePropertyValidator<
      * @return 当前校验器实例，用于链式调用
      */
     public final <X extends RuntimeException> TPropertyValidator inRange(
-        final Range<TProperty> range, final Supplier<X> exceptionSupplier) {
+            final Range<? super TProperty> range, final Supplier<X> exceptionSupplier) {
         return withRule(Conditions.inRange(range), exceptionSupplier);
     }
 
@@ -86,7 +86,7 @@ public abstract class BaseComparablePropertyValidator<
      * @return 当前校验器实例，用于链式调用
      */
     public final <X extends RuntimeException> TPropertyValidator inRange(
-        final Range<TProperty> range, final Function<TProperty, X> exceptionFunction) {
+            final Range<? super TProperty> range, final Function<TProperty, X> exceptionFunction) {
         return withRule(Conditions.inRange(range), exceptionFunction);
     }
 
@@ -95,8 +95,8 @@ public abstract class BaseComparablePropertyValidator<
      */
     private static class Conditions {
 
-        private static <TProperty extends Comparable<TProperty>> Predicate<TProperty> inRange(
-                final Range<TProperty> range) {
+        private static <TProperty extends Comparable<? super TProperty>> Predicate<TProperty> inRange(
+                final Range<? super TProperty> range) {
             return value -> value == null || range.contains(value);
         }
     }
diff --git a/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/BaseValidator.java b/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/BaseValidator.java
index b35eb58..525c493 100644
--- a/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/BaseValidator.java
+++ b/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/BaseValidator.java
@@ -109,7 +109,7 @@ public abstract class BaseValidator<T> implements IValidator<T> {
      *               示例：{@code Person::getName}。
      * @return {@code ComparablePropertyValidator}。用于添加针对该属性的校验规则。
      */
-    protected final <R extends Comparable<R>> ComparablePropertyValidator<T, R> ruleForComparable(
+    protected final <R extends Comparable<? super R>> ComparablePropertyValidator<T, R> ruleForComparable(
             Function<T, R> getter) {
         ComparablePropertyValidator<T, R> validator = new ComparablePropertyValidator<>(getter);
         this.rules.add(validator::validate);
diff --git a/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/ComparablePropertyValidator.java b/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/ComparablePropertyValidator.java
index db5a9a6..3a7bce8 100644
--- a/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/ComparablePropertyValidator.java
+++ b/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/ComparablePropertyValidator.java
@@ -26,7 +26,7 @@ import java.util.function.Function;
  * @see com.google.common.collect.Range
  * @author ZhouXY
  */
-public class ComparablePropertyValidator<T, TProperty extends Comparable<TProperty>>
+public class ComparablePropertyValidator<T, TProperty extends Comparable<? super TProperty>>
         extends BaseComparablePropertyValidator<T, TProperty, ComparablePropertyValidator<T, TProperty>> {
 
     ComparablePropertyValidator(Function<T, ? extends TProperty> getter) {
diff --git a/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/MapValidator.java b/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/MapValidator.java
index 4cbb010..cb16276 100644
--- a/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/MapValidator.java
+++ b/plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/MapValidator.java
@@ -173,7 +173,8 @@ public abstract class MapValidator<K, V> extends BaseValidator<Map<K, V>> {
      * @param key key
      * @return 属性校验器
      */
-    protected final <E extends Comparable<E>> ComparablePropertyValidator<Map<K, V>, E> ruleForComparable(K key) {
+    protected final <E extends Comparable<? super E>> //
+    ComparablePropertyValidator<Map<K, V>, E> ruleForComparable(K key) {
         @SuppressWarnings("unchecked")
         Function<Map<K, V>, E> getter = m -> (E) m.get(key);
         return ruleForComparable(getter);
diff --git a/plusone-validator/src/test/java/xyz/zhouxy/plusone/map/validator/MapValidatorTests.java b/plusone-validator/src/test/java/xyz/zhouxy/plusone/map/validator/MapValidatorTests.java
index 0833fa1..106cb4c 100644
--- a/plusone-validator/src/test/java/xyz/zhouxy/plusone/map/validator/MapValidatorTests.java
+++ b/plusone-validator/src/test/java/xyz/zhouxy/plusone/map/validator/MapValidatorTests.java
@@ -122,14 +122,14 @@ class ParamsValidator extends MapValidator<String, Object> {
                 .notNull(d -> ExampleException.withMessage("The doubleProperty cannot be null, but it was %s", d));
         ruleForString(STRING_PROPERTY)
                 .notNull();
-        ruleForComparable(DATE_TIME_PROPERTY)
+        this.<LocalDateTime>ruleForComparable(DATE_TIME_PROPERTY)
                 .notNull("The dateTimeProperty cannot be null");
         ruleFor(OBJECT_PROPERTY)
                 .notNull(() -> ExampleException.withMessage("The objectProperty cannot be null"));
-        ruleForCollection(STRING_LIST_PROPERTY)
+        this.<String>ruleForCollection(STRING_LIST_PROPERTY)
                 .notNull(d -> ExampleException.withMessage("The stringListProperty cannot be null, but it was %s", d));
 
-        ruleForPair(STRING_PROPERTY, STRING_PROPERTY2)
+        this.<String, String>ruleForPair(STRING_PROPERTY, STRING_PROPERTY2)
                 .must((str1, str2) -> str1 != null && str1.equals(str2),
                         "'stringProperty' must be equal to 'stringProperty2'.");
     }