Abstract: Deriving occurrence parameter of a plane by employing coordinates (X，Y, Z ) of three points on the plane is well introduced in the textbooks. Although the method is simple. it is quite tedions when using it. This paper takes computer as means,Jeducing calculation formula . and designing application programmes. Although procedure of the deducing is quite complicated. it is very simple in applicatron. The computer can complete requirements of calculation. printing oui data of the original coordinates, well depth and occurrence parameters. and plotting graph of three point plane simply by inputing data of geographical coordinates and well depth.