Data has become an important asset for an enterprise. How to effectively control access to data within an enterprise and securely share data between enterprises have been a challenge. Distributed ledger in blockchain can solve these problems in some ways. However, the asymmetric encryption mechanism applied by blockchain can only be transmitted peer to peer securely; it does not meet the complex access control requirements within the enterprise. This paper presents a model for data access control and sharing using block chain, and uses attribute based encryption to control and share enterprise data, so as to achieve the purpose of fine-grained access control and secure sharing. Through comparative analysis, the model can solve difficulties ofaccess control withinthe enterprise and sharing data between enterprises in security and performance.