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Aiming at the shortcomings of liquid flow monitoring of missile launcher, a deep research is carried out to solve the defect of traditional test scheme, such as low precision, easy interference and poor temperature adaptability. Analyze the reason of the problem by combining a lot of experimental data. In hardware, Holzer device is innovatively applied to collect liquid flow; besides, the design of processing circuit is introduced. In order to meet the needs of multi applications, RS485 bus and lithium battery is increased. In software, the optimization method of frequency measurement is used to effectively reduce the processor load. The errors are avoided by the method of real-time temperature compensation. Adopting a form of tree menu, it’s easily to realize the whole architecture as a generalized view and effectively avoid multiple cycles. Users are provided a friendly GUI. The test results show that the comprehensive performance of the monitor is not only much better than the traditional equipment but also has a powerful stability and reliability. This type of flow monitor has been successfully passed through acceptance now.