"Objective Analysis and Graphic System″ is a two-dimensional plot program with friendly graphic interface, which runs on Microsoft Windows. It has many kinds of data interface, and can plot contour, streamline, vector, geographic maps and so on. The software also can conduct the objective analysis for conventional meteorological observation data and output the analyzed data to the specified directory of PC. Based on the output data files, the user can choose some pressure layer and the various variables to plot the meteorological maps.