众所周知,化归思想是一种重要的数学思想。大至一门学科、一项思维工程的总构思,小至一个基本问题的解决,无不体现着化归思想的巨大作用。本文将对立体几何中常用到的几种化归思路进行剖忻,这无论对培养学生的化归意识,还是提高他们的解题能力,都有所裨益。一,立几到平几的化归思路分析将立几问题化归为熟知的平几问题,是解决立几问题的重要途径,其基本思路及化归手 As we all know, returning to the mind is an important mathematical idea. As large as a subject, the general idea of ​​a thinking project, as well as the solution to a basic problem, all reflect the great role of returning to the idea. This article will review some of the ideas that are commonly used in solid geometry, which will benefit both students’ awareness of their transformation and their ability to solve problems. First, the analysis of how to turn a few lines to a few lines turns the problem into a well-known problem. It is an important way to solve the problems of legislation, and its basic ideas and transformation