The paper introduces the main character of the YanHua PCI-1721. It has a waveform output with a 10MHz most update rate ,and a function of auto calibration ,and a card ID and so on. It’s the perfect choose in the application of fast concatenation simulation output or the real time waveform output . The correct mode of signal connection has been given. The method of the produce of virtual signal based on the PCI-1721 has been argumentation in the applications of some TACAN simulation. The simulation output implement by DMA (Direct Memory Access) with the used of PT_FAOWaveFormStar and DRV_FAOWaveFormStart.