A novel system for fingerprint verification is proposed and constructed with a liquid crystal light valve and a liquid crystal display in this paper.In this system,a right-angle prism is used to input fingerprint,the reference fingerprint and the fingerprint to be recognized are transformed lying two light beam,which debase the demand for resolution of liquid crystal light valve.With a high pass filter in the spectrum plane,the system performs fingerprint preprocessing and correlation in a single step,which not only cut down a middle process,but also enhance the cross-correlation signal,so the identify is rapidly and accurately.The experimental results show that the system is compact,high real-time,high discrimination and to be miniaturized and utilized.