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The traditional spacecraft external heat flow measurement and control system has poor ability to process big data ,long control cycle,poor control accuracy and poor program maintainability,which lacks of the fault location-processing mechanism.In order to solve the above problems,an external heat flow software system for spacecraft vacuum thermal test based on virtual instrument is developed,which uses the queue processing framework with multithreading and low coupling and adopts overall layered software design with top-down refinement.The software also programs each function module independly to convenice developers to maintenance procedure in parallel and update drivers of programmable power supply and temperature acquisition equipment. New fault handling mechanism was added,which locates and repairs faults quickly and automatically to ensure the stability of long-term operation of the test. Data management and report generation function are also included. Temperature error range is ±0.4 ℃,which has high application value.