多精度三角网可用于数据压缩及进行不同细节程度的2.5维分析处理，现有建立多精度三角网的算法功能单一，不能满足随时改变精度的要求。该文给出了一套完整的建立多精度的三角网的算法，包括建立基本三角网，在三角网中增加点和删除点等。并且实现了两个运行版本，一个可建立指定精度的三角网，另一个可在运行中

The triangulated irregular network(TIN) is a very useful model for data compression and 2 5D analysis.Unfortunately,published algorithms of building multiresolution TIN can't meet the demand of adjusting precision momentarily.This paper presents a set of algorithms for building multiresolution TIN.It covers algorithms of constructing fundamental TIN,of adding points to the current TIN and of removing points from the current TIN.All algorithms were encoded with MSC.Two versions of executable program were provided.One for creating precision determined TIN,the other for adjusting the precision when running.Test result proves the algorithms are correct and the programs are stable and reliable.