中文摘要：

砂岩分类三角图的绘制对岩石的命名和分析非常重要。常用的绘制方法有Grapher软件绘图和Excel作图。在采用这2种方法时,常会出现绘图数据和三角图端元不对应以及没有对三端元数据总和进行100%预处理的问题,导致所得三角图错误,致使岩石命名和岩性分析错误。讨论了引起错误的根源,提出了应用Grapher软件和Excel绘制三角图的正确绘图途径,对2种方法在使用上常出现的问题进行了总结。

英文摘要：

Drawing a triangle of sandstone classification diagram has important theoretical and practical significance to rock named and lithology analysis.There are two common methods of drawing：the Grapher graphics software and Excel drawing.When using these two methods,there are some problems.The drawing data series are not correspond with the endmember of triangle and the data sum of the endmember have not been pre-processed.It will cause the error of the triangular diagram,and eventually it will lead to the errors of rock named and lithology analysis.This paper discusses the reasons of the error.Through a set of data,this paper presented the correct drawing method by applying the Grapher software and Excel drawing.And there is a summary of the common problems while using the two methods.