Abstract: Aiming at the demand of agile command and control, a cross domain service and its implementation method has been proposed,which takes the blockchain platform as the infrastructure to enable four core services: resource sharing, dynamic authorization, instruction supervision and automatic execution, supporting various nodes securely sharing information and autonomous collaboration. Its performance has been analyzed in typical scenarios. The resource sharing service realizes data copyright and tracks data flow across different domains, and shares data securely under the condition of guaranteeing data copyright and interests of all participants. The dynamic authorization service introduces in "value transfer" mode of the trading system to utilize the "authority transfer" mode, which can realize flexible and secure authority delegation and transfer solving the problem of various levels and steps in the traditional command and control authorization. The instruction supervision service realizes secure storage and supervision of the command, which supporting the behavior monitoring and reaudit in the context of dynamic authority transfer. Automatic execution service improves the speed of cooperative action in combat scenarios, especially in intelligent unmanned combat through smart contract technology.