The invention relates to a safe distribution file system, which includes a registration server, a metadata server, an object storage apparatus and customer terminals. The registration server is used for verifying identity of customers, and providing content notes and a first session key for requesting access files by verifying the corresponding customer; the metadata server provides file notes for file access, head file and a second temporary session key to the corresponding customer according to the received directory notes and the access request ciphered by the first temporary session key; the object storage apparatus transmits cryptograph files to the corresponding customer according to the received file notes and the access request ciphered by the second temporary session key; and the customer terminals decipher cryptograph files using the access request corresponding to the first and the second temporary session key and through the head file for reading and writing of the corresponding customers. The invention can provide safe and effective guarantee to the access to the file of customers.