diff --git a/test/ttl_test.cc b/test/ttl_test.cc
index 40d38d4..eb9dc34 100644
--- a/test/ttl_test.cc
+++ b/test/ttl_test.cc
@@ -17,15 +17,15 @@ Status OpenDB(std::string dbName, DB **db) {
   return DB::Open(options, dbName, db);
 }
 
-void InsertData(DB *db, uint64_t ttl/* second */) {
+void InsertData(DB *db, uint64_t ttl/* second */, int vsize = 0) {
   WriteOptions writeOptions;
   int key_num = data_size / value_size;
-  srand(static_cast<unsigned int>(time(0)));
+  srand(0);
 
   for (int i = 0; i < key_num; i++) {
     int key_ = rand() % key_num+1;
     std::string key = std::to_string(key_);
-    std::string value(value_size, 'a');
+    std::string value(value_size + vsize, 'a');
     db->Put(writeOptions, std::to_string(i+1), value, ttl);
     // db->Put(writeOptions, key, value, ttl);
   }
@@ -36,7 +36,7 @@ void GetData(DB *db, int size = (1 << 30)) {
   int key_num = data_size / value_size;
   
   // 点查
-  srand(static_cast<unsigned int>(time(0)));
+  srand(0);
   for (int i = 0; i < 100; i++) {
     int key_ = rand() % key_num+1;
     std::string key = std::to_string(key_);
@@ -60,7 +60,7 @@ TEST(TestTTL, ReadTTL) {
     ReadOptions readOptions;
     Status status;
     int key_num = data_size / value_size;
-    srand(static_cast<unsigned int>(time(0)));
+    srand(0);
     for (int i = 0; i < 100; i++) {
         int key_ = rand() % key_num+1;
         std::string key = std::to_string(key_);
@@ -83,6 +83,49 @@ TEST(TestTTL, ReadTTL) {
     delete db;
 }
 
+TEST(TestTTL, GetEarlierData) {
+  DestroyDB("testdb",Options());
+  DB *db;
+  if(OpenDB("testdb", &db).ok() == false) {
+      std::cerr << "open db failed" << std::endl;
+      abort();
+  }
+
+  uint64_t ttl1 = 3;
+  uint64_t ttl2 = 5;
+  uint64_t extra_size = 1;
+
+  InsertData(db, ttl2);
+  InsertData(db, ttl1, extra_size); //后一个数据长度变化一下
+
+  //都没过期先找到后插的
+  Env::Default()->SleepForMicroseconds(1 * 1000000);
+  int key_num = data_size / value_size;
+  ReadOptions readOptions;
+  Status status;
+  srand(0);
+  for (int i = 0; i < 100; i++) {
+        int key_ = rand() % key_num+1;
+        std::string key = std::to_string(key_);
+        std::string value;
+        status = db->Get(readOptions, key, &value);
+        ASSERT_TRUE(status.ok());
+        ASSERT_EQ(value.size(), value_size + extra_size);
+    }
+  
+  //再找到前一次
+  Env::Default()->SleepForMicroseconds(3 * 1000000);
+  for (int i = 0; i < 100; i++) {
+        int key_ = rand() % key_num+1;
+        std::string key = std::to_string(key_);
+        std::string value;
+        status = db->Get(readOptions, key, &value);
+        ASSERT_TRUE(status.ok());
+        ASSERT_EQ(value.size(), value_size);
+    }
+  delete db;
+}
+
 TEST(TestTTL, CompactionTTL) {
   DestroyDB("testdb",Options());
     DB *db;