Abstract: Wind profiler radar (WPR) is mainly used to detect atmospheric wind fields based on electromagnetic scattering of atmospheric turbulence. WPR can simultaneously receive the scattered echo of atmospheric turbulence and precipitation particles during precipitation. Therefore, the power spectrum of WPR in precipitation contains both the spectrum of atmosphere and the spectrum of precipitation. In this situation, the information of atmospheric vertical motion is contaminated by the movement of raindrops, leading to errors in subsequent retrieval of atmospheric motions. However, millimeter-wave cloud radar can only detect raindrops and cloudwater drops during precipitation. This paper aims to suppress the precipitation interference on WPR based on millimeter-wave radar observations. Verification and analysis of the spectrum is conducted for a classical weak precipitation case in the present study. Comparison and analysis of two-peak velocity, modified velocity and original WPR velocity show that the method can successfully eliminate effects of precipitation on atmospheric velocity retrieval during weak precipitation. It can also obtain turbulence velocity from WPR when turbulence echo is quite faint. However, the attenuation of cloud radar during precipitation will have negative influences on the results of the method, which makes it only suitable for weak precipitation events and at lower levels at present.