构造法解题是一种富有创造性的思维方法。很多三角问题若用构造法求解,可获得新颖、独特、简捷的解法。根据题目特征,恰当构造数学模型,是灵活运用构造法的关键。本文举例介绍几种方法。 Constructive problem solving is a creative way of thinking. If many trigonometric problems are solved by the construction method, a novel, unique, and simple solution can be obtained. According to the characteristics of the topic, the proper construction of mathematical models is the key to the flexible use of construction methods. This article gives an example of several methods.