Abstract: Aimed at the problem of low efficiency in data cross-domain sharing between different management domains, an updateable access strategy and cross-domain data sharing scheme for multi-management domains are proposed. By introducing proxy re-encryption on the basis of attribute encryption scheme, flexible access strategy update could be achieved without decrypting the cloud ciphertext. By introducing the cooperative key in the process of generating the re-encrypted key, the data sharing among multiple management domains was realized, and the number of re-encrypted times in multi-party collaboration was reduced, so that one re-encryption could be accessed by users in multiple management domains. The efficiency and practicability of the scheme were verified by comparative analysis and simulation experiments.