diff --git a/include/HFlashServer.h b/include/HFlashServer.h
index 2c52880..83f2668 100644
--- a/include/HFlashServer.h
+++ b/include/HFlashServer.h
@@ -63,7 +63,7 @@
 #define HFLASH_SYNC_PAGE_INFO_TIME 800
 #endif
 
-///< 同步备份页表信息时间ms
+///< 同步备份和备份页表信息时间ms
 #ifndef HFLASH_SYNC_BACKUP_TIME
 #define HFLASH_SYNC_BACKUP_TIME 1000
 #endif
diff --git a/src/HFlashMem.c b/src/HFlashMem.c
index a5bf592..c41cf33 100644
--- a/src/HFlashMem.c
+++ b/src/HFlashMem.c
@@ -101,16 +101,18 @@ static void CheckSyncCache()
 
     uint16_t needErase = sInfo.useNum;
     uint8_t heat = MAX_HEAT;
+    uint8_t waitWrite = 0;
     for (uint16_t i = 0; i < sInfo.useNum; ++i) {
         // 检查哪个页的异步擦除, 现在擦除完成
         if (sOpts->cache[i].eraseStatus == kEraseStart) {
             sOpts->cache[i].eraseStatus = kWaitWrite;
         }
 
+        waitWrite |= sOpts->cache[i].isDirty;
         // 寻找需要擦除的页
         if (sOpts->cache[i].isDirty && sOpts->cache[i].eraseStatus == kEraseWait) {
             // 查找最低热度的优先擦除
-            if (sOpts->cache[i].heat < heat) {
+            if (sOpts->cache[i].heat <= heat) {
                 heat = sOpts->cache[i].heat;
                 needErase = i;
             }
@@ -137,7 +139,7 @@ static void CheckSyncCache()
         sOpts->ioctl(sOpts->cache[needErase].addr, kHFlashMemIOErase, NULL);
     }
 
-    if (sInfo.needWaitErase == 0) {
+    if (sInfo.needWaitErase == 0 && waitWrite == 0) {
         if (sCheckTimer != HTIMER_INVALID) {
             HTimerRemove(sCheckTimer);
             sCheckTimer = HTIMER_INVALID;
@@ -160,7 +162,7 @@ static HFlashMemCache *FindCache(uint32_t addr, uint8_t create, uint8_t needRead
     addr = Align4K(addr);
     if (addr + HFLASH_BLOCK_SIZE > sOpts->flashSize) {
         LogE("flash addr[0x%08x] size[%d] overflow", addr, sOpts->flashSize);
-        return 0;
+        return NULL;
     }
 
     for (uint16_t i = 0; i < sInfo.useNum; ++i) {
@@ -308,7 +310,7 @@ void HFlashMemInit(HFlashMemOpts *opts)
         return ;
     }
 
-    if (IS_4K(sOpts->flashSize) == 0) {
+    if (sOpts->flashSize == 0 || IS_4K(sOpts->flashSize) == 0) {
         FATAL_ERROR("flash Size not 4k align");
         return ;
     }
diff --git a/src/HFlashServer.c b/src/HFlashServer.c
index 65a5fed..988c9f1 100644
--- a/src/HFlashServer.c
+++ b/src/HFlashServer.c
@@ -679,6 +679,11 @@ static uint8_t IsOverLap(HFlashAddr_t srcAddr, uint32_t size, HFlashAddr_t dstAd
         return 1;
     }
 
+    if (srcAddr == dstAddr) {
+        FATAL_ERROR("addr[0x%08x] dstAddr[%d] overflow", srcAddr, dstAddr);
+        return 1;
+    }
+
     // 非重叠
     if (srcEnd <= dstAddr || dstEnd <= srcAddr) {
         return 0;