In this paper, we describe a migration process of ETL system to localized server environment in a large state-owned bank branch. Using technologies of data separation based on application domain and data synchronization based on views/materialized views, data, data synchronization, Synonym, we mainly accomplish the process of migrating branch-related data from imported server environment to localized server environment. In this process, the cause of data incorrectness during application migration is found, which arises from insufficiently support of commercial database system to temporal data. This problem makes it difficult to develop programs to check data synchronization result. In the actual process of migration, through the corresponding measures to ensure that we successfully completed the migration process.