The structure and format of 713model radar data, Plain Position Indicator (PPI) and Range Height Indicator (RHI), are introduced briefly. After fully analyzing, the interpretation of radar data is completed accurately by using Visual Basic.NET 2005. Selecting MapX as the secondary development components, the geovisualization of radar data by both line and region is realized under the polar coordinate system, including PPI and RHI, by means of the traditional algorithms of creating radar images. The method can recover, to the utmost, the echo information of radar data and provide an accurate analysis basis for regional precipitation.