IPOS（Inter Planetary Optimal Storage）is a distributed storage system based on blockchain technology .Distributed attribute and encryption algorithm are used to realize access control of user data. The authenticity and reliability of user data files can be guaranteed by using the non-tamperability of blockchain. The distributed technology in blockchain is used to increase the transparency of file transfer process and file operation of storage nodes. Using the distrust mechanism provided by the blockchain platform, the files are cut and stored in the peer-to-peer network, and the key summaries of the files are chained. While ensuring the distributed management of file information, the users' data content is not disclosed. IPOS aims to solve the problems of insecurity, verbosity, and inefficiency in traditional storage. Its vision is to provide more secure, efficient, low-cost, and more sustainable cloud storage services to users around the world. Every storage and sharing action generates value.