Cloud computing plays a main role in present day-to-day life. Security & privacy of data is major task in cloud. It is required to protect data from hackers & introdures. To provide more security this paper present multi attribute authority CiPher text Attribute Based Encryption (CPABE) technology with multi Central Authority (CA). Due to untrusted cloud server data access control becomes challenging task in cloud computing. Current data access control scheme is no longer applicable to cloud storage system, because it can't provide fully trusted cloud server.