面积法就是运用面积关系来证明或计算平面几何题的方法 ,它是解几何问题的一种重要数学方法。本文通过具体的实例说明面积法在初中几何中求线段的比、计算线段的长、证比例式、证两角相等、证线段的和差等五方面的应用。 Area method is to use the area relationship to prove or calculate the method of plane geometry, it is an important mathematical solution to the problem of geometry. This paper illustrates the application of the area method in finding the ratio of the line segments in the geometry of junior high schools, and calculating the length of the line segments, the ratio of syndromes, the equality of syndromes, the sum of syndrome segments, and so on through a concrete example.