Abstract: The plotting package which introduced in this paper has strong and complete functions of plotting. It can plot geological contour map, well site map. 3D-structural map, comprehensive columner section, cross section, geologic evolution section. and verious oil development curves. Furthermore, it can also plot more than one hundred kinds of diagram of curves, block diagram，scattered diagram with many types of coordinate, such as rightangled coordinate, semi-logistic coordinate, log. - log. coordinate, etc. In addition, it can write single-line and double-line Chinese character with plotting, as v/ell as combine various maps together flexibly.