Abstract: In view of the advantages that polarization parameters of dual-polarization radar can provide more features in echo identification, the polarization parameter is introduced to realize ground clutter recognition based on the fuzzy logic algorithm of conventional Doppler weather radar. According to the characteristics of the ground clutter and precipitation echo, six characteristic parameters with the most obvious difference are selected to establish the statistical distribution probability of characteristic parameters, and the best membership function of ground clutter identification is given by using CSI evaluation criteria.Taking the X-band all-solid-state dual-line polarization radar newly installed in Panzhihua City in 2020 as an example, the recognition effect of traditional and improved fuzzy logic algorithm is compared. The results show that the fuzzy logic algorithm with polarization parameter can better identify the ground object echo at the mixed position of precipitation and ground object, and improve the problem that the area with radial velocity zero is misjudged as the ground object echo.