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In the light of too much test links, difficult to define test purpose and to test online in the command and control system, we analyze the test requirements of the command and control system based on the aspects that consist of the functional positioning, the composition architecture, the usage mode, and the life cycle management. The research of the design of test method and the function realization of the command and control system specially by the determination of test purpose, the settings of test items, the selection of test parameters, the designing of test methods and process, the evaluation of test results. Based on the research, we propose a general test system and test method of the command and control system, which is already applied to project engineering. The new method can improve test coverage greatly, which can provide technical support for the online test and on duty power up for long term.