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For the demand of the seeker flying test achieving control and high real-time, it designs the control box system based on LabWindows/CVI software development platform. The flying control box are connected to seeker through RS422 serial ports, it can achieve seeker control, state display, receiving and processing of GPS Information, test data storage,and other functions. Flying control box is designed based on VXI bus and LabWindows/CVI software platform. The software uses multithreading technology of LabWindows/CVI software development platform, it divides periodic tasks such as serial ports from data processing, storage, display and other tasks on time, improves the CPU efficiency. The test results show that the flying control system works steadily, communicates reliably with seeker, gets test data completely and meeting the general requirements.