Introduction of a criminal investigation of video surveillance system based on cloud computing architecture, and one of the cloud storage strategies for a special design and modeling. The explosive growth of unstructured data trend, the traditional storage technologies in throughput scalability and ease of management and other aspects need to be improved, in order to cloud storage and storage system reliability theory, the establishment of a distributed storage model for unstructured data. By analyzing forensic video data storage problems, with cloud storage technology to store forensic video data can be stored in the mass privatization of the read-only forensic video data on inexpensive untrusted nodes and provide efficient and reliable access. Relative to the centralized storage, the new system has high availability. Simulation results show high reliability and easy storage expansion, the distributed storage system can be applied dynamically open computing environment, providing high performance cloud storage service.