Abstract: As a reliable scheme, the ciphertext-policy attribute-based encryption(CP-ABE) can realize the data confidentiality and fine-grained access control. However, CP-ABE is only suitable for single-authority system, not for multi-authority system in the cloud storage. This paper proposes an improved multi-authority system model and obtains MACP-ABE scheme by modifying standard CP-ABE. MACP-ABE scheme not only supports the improved multi-authority system to realize fine-grained access control, but also supports users'attribute revocation and achieves the dynamic attribute management. The experiment results show that the proposed method can effectively reduce the overall computation.