关于三角形内分割线段比的问题,是几何证题中的常见题型之一,其解法通常是添加平行线转移线段比.由于辅助线添法因题而异、灵活多变,故常有学生耗时费神仍不得其解.本文通过研究一般情况下三角形内分割线段比间的关系,总结出可统一解决三角形内一类线段比问题的几何定理,兹介绍如下. The problem of dividing the segment ratio within a triangle is one of the common question types in geometrical proofs. Its solution is usually to add parallel line transfer line ratios. Because the auxiliary lines are different and flexible, they are often used by students. Time Feishen still can not understand. In this paper, by studying the relationship between the dividing line segments in the triangle, the geometric theorem that can solve the problem of a class of line segments in a triangle is summarized.