Abstract: Based on the principle of convolution calculation,this study improves the conventional convolution method and constructs the isolated point convolution kernel,linear convolution kernel,and weak echo convolution kernel. Based on this improved conventional convolution method and these new kernels,the non-meteorological echoes and the areas with weak echo,such as isolated point echo,linear echo and ground object echo in single radar station,and combined reflectivity puzzle echo images,can be quickly eliminated. The isolated point convolution kernel can eliminate the point echo with the length and width no more than 3 pixels. The equal width linear convolution kernel can eliminate the linear echo with the horizontal,vertical and inclined cross section no more than 3 pixels. The radial convolution can eliminate the radial echo with the cross section no more than 11 pixels. The weak echo convolution kernel can eliminate the ground object echo and weak echo.