In order to improve the security and efficiency of cloud computing data access, the improved CPABE algorithm is adopted to control the mobile cloud computing data access. The scheme classifying files according to different access rights, defining each access right as a permissions model, and then integrating multiple permissions model structures. This scheme adopts the shared mode for the ciphertext processing, and all the ciphertext models share the ciphertext so as to effectively reduce the time cost of storing the ciphertext for each rights model. Experimental results show that the proposed shared ciphertext scheme could effectively reduce the time overhead in the encryption and decryption process, and it has significant application value.