In order to achieve the goal of testing support of unmanned surface vehicles (USVs), by leveraging typical unmanned system features for USVs, this paper analyzes the testing support requirements, proposes a testing support method for shore-sea integration, and establishes a shore-sea integration testing support system. Based on the server-end and client-end modes, a testing support system with real-time monitoring of boats, periodic self-tests, online fault analysis and parallel systems is established, which can greatly reduce the adverse consequences caused by performance degradation or failures of USVs.