Abstract: Aiming at the problems of the single authorization mode, centralization and lack of auditing methods for the traditional userpermission management in C4ISR, a blockchain-based user permission management scheme for C4ISR is proposed. The “multi-chain”architecture of the blockchain is used to divide the business seats of the C4ISR, separates different business data from each other atthe operational level. Through the design of user permission policies, the unified standard management of user operation behavior inC4ISR is implemented. Experimental and analytical results show that our scheme implements decentralized and non-tamperable userpermission data recording mode which is more secure than traditional schemes in C4ISR, and expands the “single-chain” blockchainarchitecture to improve data utilization.