Abstract: In view of shortcomings of traditional testing methods of automatic voltage regulator such as few test items, poor security, high construction cost, big difference in equipment parameters, a design scheme of new general testing system of automatic voltage regulator based on LabWindows/CVI was put forward. Structure and principle of the testing system were introduced. The testing system realizes AVR dynamic test and has many advantages such as complete testing project, short testing circle, preferable universality and so on compared with traditional testing systems.