From all kinds of models of contour interpolation, introduces the program of the triangle-net model of linear interpolation developed by the development language MDL ( MicroStation Development Language) based on the MicroStation, and puts it in practice. 本文从介绍等高线内插的各种数学模型入手,并基于MicroStation的二次开发语言MDL(MicroStationDevelopmentLanguage)采用三角网/线型插值法建立数学模型编制了内插程序,且运用到生产中。