There are some advantages and disadvantages when using cold storage medium and hot storage medium separately. To solve this problem, the disk array is used as the disk storage layer, and the Blu-ray disc library is used as the optical storage layer, and a multi-level distributed object storage system is formed by reasonably combining cold storage and hot storage. Then based on the multi-level distributed object storage system, an effective data storage method is designed. The functions of data reading, recording and reverse recovery are realized to provide users with effective storage services and improve data storage efficiency and resource utilization. Finally, the system is tested to verify the feasibility and effectiveness of the system.