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The software and hardware of vehicle control unit will be updated frequently in the electric vehicle development process. In order to realize quick matching and meet the demand for higher efficiency and test throughput for VCU, designed a general automatic test system. The system consists of a ready-to-use test action library and device driver developed in LabVIEW, and uses TestSand as test execution module. The test action library executes test activities and exchanges data with device driver through TestStand engine. Developed a test project management software that covers the whole VCU test process and ensures traceability. The results of practical test application verify that the system can match the unit under test rapidly, implement executable test sequences and spot defects efficiently with good stability and generality.