转换法是把某些难以测量或难以测准的物理量转换成能测量、测得准的物理量,或把某些看不见、摸不着、不易显示的物理现象转换成易显示的现象的一种研究方法,是初中物理中重要的科学方法之一.在《平面镜成像》教学中彰显转换法是教师教学智慧的体现,运用转换法把虚像转换为实物,使虚像的大小和像距的测量成为可能,既科学,又实用. Conversion method is to convert some difficult to measure or difficult to measure the physical quantity can measure, measure the quasi-physical quantity, or some invisible, invisible, not easy to display the phenomenon of physical phenomena into a display Method is one of the most important scientific methods in junior middle school physics.This paper shows that the transformation method is the embodiment of teachers’ teaching wisdom in the teaching of “flat mirror imaging”, and the transformation method is used to convert virtual images into real objects, making the size of virtual images and the measurement of image distance possible , Both scientific and practical.