To solve the safety issues in cloud storage services for network characteristics and data sharing characteristics

and based on the CP-ABE（cipertext policy-attribute based encryption） algorithm

a cipher text access control mechanism was proposed.According to access control and related architecture

the corresponding secure data structure algorithms were given.After this

the simulations and the performance analysis were given to evaluate our algorithm.Under the premise of untrusted service provider

the proposed mechanism can ensure the data security of the cloud storage system in an open environment

and can reduce right management complexity through property management.