diff --git a/interfaces/innerkits/appverify/src/util/hap_signing_block_utils.cpp b/interfaces/innerkits/appverify/src/util/hap_signing_block_utils.cpp
index 693c4f35b6f08c63df9168f49366eeb9e223b435..9cceae30e2f1848c74bbab0652a0472251dea1a1 100644
--- a/interfaces/innerkits/appverify/src/util/hap_signing_block_utils.cpp
+++ b/interfaces/innerkits/appverify/src/util/hap_signing_block_utils.cpp
@@ -49,7 +49,7 @@ const int32_t HapSigningBlockUtils::ZIP_EOCD_COMMENT_LENGTH_OFFSET = 20;
 const int32_t HapSigningBlockUtils::ZIP_CD_OFFSET_IN_EOCD = 16;
 const int32_t HapSigningBlockUtils::ZIP_CD_SIZE_OFFSET_IN_EOCD = 12;
 const int32_t HapSigningBlockUtils::ZIP_BLOCKS_NUM_NEED_DIGEST = 3;
-const int32_t HapSigningBlockUtils::ZIP_UPDATE_DIGEST_THREADS_NUM = 4;
+const int32_t HapSigningBlockUtils::ZIP_UPDATE_DIGEST_THREADS_NUM = 2;
 
 const char HapSigningBlockUtils::ZIP_FIRST_LEVEL_CHUNK_PREFIX = 0x5a;
 const char HapSigningBlockUtils::ZIP_SECOND_LEVEL_CHUNK_PREFIX = 0xa5;