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This paper deals with the AC -drive locomotive converter tests based on Pulse -Width Modulation (PWM) controls. Compared with limit of some current test systems, it designs a computer system combined with Virtual Instrument skills. Then virtual Instrument skills provide an operable and visual measure system. And the computer deals with the data. In this paper various test means are discussed, and new harmonic test method is presented. The essential functions are realized, which has brought about new references in the Locomotive converter test fields.Chapter 2 first presents a general frame of the design idea. Then points out range of the tests. The chief require of hardware and software has been indicated.Chapter 3 first presents the input and output characters test means. And designs the voltage, current and moment test circuits. Then test and analysis the moment and frequency characters combined with the circuits.Chapter 4 mainly introduces the harmonic test method. It measures and analysis the harmonic with the sampling circuit and computer FFT transform. Then validity of the method is proved through the Wellsupp-90 converter system. At last, the problem of harmonic elimination is discussed.Chapter 5 deals with the input and output power tests. The means of power factor calculation is discussed. The Phase-gap and aberrance factor measuring circuits are presented. It also calculates the converter efficiency by power analysis. And studies the factors that have influence on converter efficiency.Chapter 6 presents the system software. With Virtual Instrument skills the alternative interface is established. And the visual analysis method is introduced. The measure and analysis platform as a whole is presented. Finally software methods in system interfere disposal are discussed.