diff --git a/services/distributeddataservice/service/data_share/gaussdb_rd/src/common/include/doc_limit.h b/services/distributeddataservice/service/data_share/gaussdb_rd/src/common/include/doc_limit.h
index 557b92da52af289493c275975b93c30d6b707de2..fc2515f323e0e25c6af78f73b3e57930d62b60db 100644
--- a/services/distributeddataservice/service/data_share/gaussdb_rd/src/common/include/doc_limit.h
+++ b/services/distributeddataservice/service/data_share/gaussdb_rd/src/common/include/doc_limit.h
@@ -17,6 +17,6 @@
 #define DOC_LIMIT_H
 
 namespace DocumentDB {
-constexpr int MAX_DB_CONFIG_LEN = 512 * 1024; // 512 * 1024: 512k length
+constexpr int MAX_DB_CONFIG_LEN = 1024 * 1024; // 1024 * 1024: 1024k length
 } // namespace DocumentDB
 #endif // DOC_LIMIT_H
\ No newline at end of file
diff --git a/services/distributeddataservice/service/data_share/gaussdb_rd/test/unittest/api/documentdb_api_test.cpp b/services/distributeddataservice/service/data_share/gaussdb_rd/test/unittest/api/documentdb_api_test.cpp
index d4518ff6eb2bd2b33ffe1a405bf5fb48e087de69..5aec50c05538d96400b546b027a829d9ed7d50b3 100644
--- a/services/distributeddataservice/service/data_share/gaussdb_rd/test/unittest/api/documentdb_api_test.cpp
+++ b/services/distributeddataservice/service/data_share/gaussdb_rd/test/unittest/api/documentdb_api_test.cpp
@@ -16,6 +16,7 @@
 #include <gtest/gtest.h>
 
 #include "doc_errno.h"
+#include "doc_limit.h"
 #include "documentdb_test_utils.h"
 #include "grd_base/grd_db_api.h"
 #include "grd_base/grd_error.h"
@@ -226,6 +227,35 @@ HWTEST_F(DocumentDBApiTest, OpenDBConfigTest003, TestSize.Level0)
     EXPECT_EQ(status, GRD_INVALID_ARGS);
 }
 
+/**
+ * @tc.name: OpenDBConfigTest004
+ * @tc.desc: call GRD_DBOpen, input the value's length of configStr is 1024K
+ * @tc.type: FUNC
+ * @tc.require:
+ * @tc.author: mazhao
+ */
+HWTEST_F(DocumentDBApiTest, OpenDBConfigTest004, TestSize.Level0)
+{
+    /**
+     * @tc.steps:step1. input the value's length of configStr is 1024 k(not contained '\0')
+    */
+    GRD_DB *db = nullptr;
+    std::string part1 = "{ \"pageSize\": \" ";
+    std::string part2 = "\" }";
+    std::string path = "./document.db";
+    std::string val = string(MAX_DB_CONFIG_LEN - part1.size() - part2.size(), 'k');
+    std::string configStr = part1 + val + part2;
+    int ret = GRD_DBOpen(path.c_str(), configStr.c_str(), GRD_DB_OPEN_CREATE, &db);
+    EXPECT_EQ(ret, GRD_OVER_LIMIT);
+    /**
+     * @tc.steps:step2. input the value's length of configStr is 1024 k(contained '\0')
+    */
+    std::string val2 = string(MAX_DB_CONFIG_LEN - part1.size() - part2.size() - 1, 'k');
+    std::string configStr2 = part1 + val2 + part2 + "\0";
+    ret = GRD_DBOpen(path.c_str(), configStr2.c_str(), GRD_DB_OPEN_CREATE, &db);
+    EXPECT_EQ(ret, GRD_INVALID_ARGS);
+}
+
 /**
  * @tc.name: OpenDBConfigMaxConnNumTest001
  * @tc.desc: Test open document db with invalid config item maxConnNum
@@ -381,7 +411,7 @@ int GetDBPageSize(const std::string &path)
     if (db == nullptr) {
         return 0;
     }
-    
+
     int pageSize = 0;
     SQLiteUtils::ExecSql(db, "PRAGMA page_size;", nullptr, [&pageSize](sqlite3_stmt *stmt, bool &isMatchOneData) {
         pageSize = sqlite3_column_int(stmt, 0);