diff --git a/orm/src/main/java/com/zfoo/orm/manager/OrmManager.java b/orm/src/main/java/com/zfoo/orm/manager/OrmManager.java
index 5b2aa361..d51ddc31 100644
--- a/orm/src/main/java/com/zfoo/orm/manager/OrmManager.java
+++ b/orm/src/main/java/com/zfoo/orm/manager/OrmManager.java
@@ -20,9 +20,9 @@ import com.mongodb.client.*;
 import com.mongodb.client.model.IndexOptions;
 import com.mongodb.client.model.Indexes;
 import com.zfoo.orm.OrmContext;
-import com.zfoo.orm.model.anno.*;
 import com.zfoo.orm.cache.EntityCaches;
 import com.zfoo.orm.cache.IEntityCaches;
+import com.zfoo.orm.model.anno.*;
 import com.zfoo.orm.model.config.OrmConfig;
 import com.zfoo.orm.model.entity.IEntity;
 import com.zfoo.orm.model.vo.EntityDef;
@@ -145,8 +145,8 @@ public class OrmManager implements IOrmManager {
                         var indexOptions = new IndexOptions();
                         indexOptions.unique(index.isUnique());
 
-                        if(index.isTtl()){
-                            indexOptions.expireAfter(index.getExpireAfterSeconds(), TimeUnit.SECONDS) ;
+                        if (index.getTtlExpireAfterSeconds() > 0) {
+                            indexOptions.expireAfter(index.getTtlExpireAfterSeconds(), TimeUnit.SECONDS);
                         }
 
                         if (index.isAscending()) {
@@ -333,22 +333,14 @@ public class OrmManager implements IOrmManager {
         for (var field : fields) {
             var indexAnnotation = field.getAnnotation(Index.class);
 
-            if(indexAnnotation.ttl()) {
-                if (!field.getGenericType().toString().equals(
-                        "class java.util.Date")){
-                    throw new IllegalArgumentException(StringUtils.format("[{}]不是Date类型", field.getName()));
-                }
-                if (!field.getGenericType().toString().equals(
-                        "java.util.List<java.util.Date>")){
-                    throw new IllegalArgumentException(StringUtils.format("[{}]不是List<Date>类型", field.getName()));
-                }
-                if (!field.getGenericType().toString().equals(
-                        "class [Ljava.util.Date;")){
-                    throw new IllegalArgumentException(StringUtils.format("[{}]不是Date[]类型", field.getName()));
+            if (indexAnnotation.ttlExpireAfterSeconds() > 0) {
+                var fieldType = field.getGenericType();
+                if (!(fieldType == Date.class || fieldType == Date[].class || field.getGenericType().toString().equals("java.util.List<java.util.Date>"))) {
+                    throw new IllegalArgumentException(StringUtils.format("MongoDB规定TTL类型[{}]必须是Date，Date[]，List<Date>的其中一种类型", field.getName()));
                 }
             }
 
-            IndexDef indexDef = new IndexDef(field, indexAnnotation.ascending(), indexAnnotation.unique(),indexAnnotation.ttl(),indexAnnotation.expireAfterSeconds());
+            IndexDef indexDef = new IndexDef(field, indexAnnotation.ascending(), indexAnnotation.unique(), indexAnnotation.ttlExpireAfterSeconds());
             indexDefMap.put(field.getName(), indexDef);
         }
 
diff --git a/orm/src/main/java/com/zfoo/orm/model/anno/Index.java b/orm/src/main/java/com/zfoo/orm/model/anno/Index.java
index 4ef1b456..3731ed1a 100644
--- a/orm/src/main/java/com/zfoo/orm/model/anno/Index.java
+++ b/orm/src/main/java/com/zfoo/orm/model/anno/Index.java
@@ -27,7 +27,6 @@ public @interface Index {
 
     boolean unique();
 
-    boolean ttl() default false;;
-
-    long expireAfterSeconds() default 0L;
+    // 默认小于0不开启TTL文档超时索引
+    long ttlExpireAfterSeconds() default -1L;
 }
diff --git a/orm/src/main/java/com/zfoo/orm/model/vo/IndexDef.java b/orm/src/main/java/com/zfoo/orm/model/vo/IndexDef.java
index 86133fb4..a62a5303 100644
--- a/orm/src/main/java/com/zfoo/orm/model/vo/IndexDef.java
+++ b/orm/src/main/java/com/zfoo/orm/model/vo/IndexDef.java
@@ -24,18 +24,13 @@ public class IndexDef {
     private Field field;
     private boolean ascending;
     private boolean unique;
+    private long ttlExpireAfterSeconds;
 
-    private boolean ttl;
-
-    private long expireAfterSeconds;
-
-
-    public IndexDef(Field field, boolean ascending, boolean unique, boolean ttl, long expireAfterSeconds) {
+    public IndexDef(Field field, boolean ascending, boolean unique, long ttlExpireAfterSeconds) {
         this.field = field;
         this.ascending = ascending;
         this.unique = unique;
-        this.ttl = ttl;
-        this.expireAfterSeconds = expireAfterSeconds;
+        this.ttlExpireAfterSeconds = ttlExpireAfterSeconds;
     }
 
     public Field getField() {
@@ -62,19 +57,11 @@ public class IndexDef {
         this.unique = unique;
     }
 
-    public boolean isTtl() {
-        return ttl;
+    public long getTtlExpireAfterSeconds() {
+        return ttlExpireAfterSeconds;
     }
 
-    public void setTtl(boolean ttl) {
-        this.ttl = ttl;
-    }
-
-    public long getExpireAfterSeconds() {
-        return expireAfterSeconds;
-    }
-
-    public void setExpireAfterSeconds(long expireAfterSeconds) {
-        this.expireAfterSeconds = expireAfterSeconds;
+    public void setTtlExpireAfterSeconds(long ttlExpireAfterSeconds) {
+        this.ttlExpireAfterSeconds = ttlExpireAfterSeconds;
     }
 }
diff --git a/orm/src/test/java/com/zfoo/orm/entity/MailEntity.java b/orm/src/test/java/com/zfoo/orm/entity/MailEntity.java
index 771d55c3..daa3badb 100644
--- a/orm/src/test/java/com/zfoo/orm/entity/MailEntity.java
+++ b/orm/src/test/java/com/zfoo/orm/entity/MailEntity.java
@@ -36,7 +36,7 @@ public class MailEntity implements IEntity<String> {
 
     private String content;
 
-    @Index(ascending = true, unique = false, ttl = true, expireAfterSeconds = 10)
+    @Index(ascending = true, unique = false, ttlExpireAfterSeconds = 10)
     private Date createDate;
 
     public static MailEntity valueOf(String id, String userName, String content, Date createDate) {