The driving signals of pyroelectric infrared focus plane array ( IRFPA) drive and control its readout circuit to work in p roper sequence and logical relationship, and can control the infrared signal to output and process in a cer-tain time sequence effectively. To decrease the hardware resource, virtual instrument technology is used, and virtual instrument system based on computer and the software of LabV IEW is constructed. The system controls PCI data ac-quisition card to output the needed driving signals. The results of experiment indicate that the method is feasible, and it has the software-programmable ability. Moreover it changes the method based on CPLD technology.