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In data backup systems, the use of data de-duplication in eliminating duplicate data to improve the efficiency of system storage space, will inevitably make many logical images share the data instance. The shared data is lost or changed which will cause all cited the example of logical image error. Therefore, this paper proposed a data integrity verification algorithm in data duplicate backup system. If the current backup file already existed in the data instance data server, before adding reference, it was first to use block cyclic sequence check referenced data example to judge the integrity of data instances. The experimental results show that the algorithm doesn't affect the backup speed, but also provides a validation of the algorithm on the integrity of cited backup system data instance. The algorithm improved the reliability of duplicate removal backup system. [ABSTRACT FROM AUTHOR]