The method of comparative inquiry is one of the important methods to find and solve problems, which is helpful to cultivate students'analytical and comprehensive ability. Teachers should encourage students to compare and explore materials that are close to or opposite to or even opposite to the content of the textbook, or to seek differences or similarities in the same or different materials, and from this to that, to expand and extend, to combine and accumulate, so that students can firmly grasp the regularity of things, to enlighten the mind.