To solve the problem of low security in cloud storage system under the background of rapid prevailing cloud technology, this paper studies the design and implementation of User Autonomous Encryption Cloud Storage System based on Dokan. With the help of Dokan's file development model, a specific file system intended for curtain group of users can be easily customized. In order to overcome the limitations existing in traditional cloud storage systems, this system manages to establish the environment with embedded AES encryption algorithms on local clients and cloud storage servers based on OpenStack. The experimental results show that the User Autonomous Encryption Cloud Storage System based on Dokan is of higher security when compared with the traditional cloud storage systems.