Abstract: The BEPC's cyclic examination system of power supplies is established. The data acquisition system is programmed with LabVIEW instead of C code. This system not only can examine the stability of new power supplies for twenty four hours, but also can examine cyclically the power supplies that are being used. The interface is simple and beautiful. The user of LAN can conveniently access to the system and acquire data. The acquired data are stored in Excel, in order to building database in the future.