The gradient velocity azimuth display (GVAD) technology has been developed to get over the influence of velocity aliasing in traditional velocity azimuth display (VAD) technology, which can calculate the vertical wind profiler (VWP) above the radar. This paper first introduced the theory of GVAD technology and conducted simulation, and analyzed about the GVAD technology, and then applied it into the case of typhoon and severe precipitation monitored by CINRAD. The simulation result demonstrated that the GVAD technology can overcome the velocity aliasing effectively compared with the traditional VAD technology, and the added noise also can be depressed through lowpass filter. The influence of aliasing velocity was got over in the two cases, but the noise and fluctuation in radial velocity were enlarged by the gradient of radial velocity, which affected the retrieval accuracy of wind although the lowpass filter was adopted, especially, the retrieval accuracy of wind speed was impacted. In the examples, the retrieved wind speed by GVAD technology was 2-3 m·s-1 less than the value by the traditional VAD technology. So, the influence of noise and fluctuation in CINRAD on GVAD technology should be further studied and reduced.