Mathematics education activities in kindergartens should be closely related to children's lives. In this activity, teachers chose the conservation of area, which is difficult for children in large classes to understand, as the teaching content to help them understand the concept of conservation of area. Teachers can turn this knowledge point into an operational and exploratory teaching activity, and at the same time, cultivate children's hands-on operation ability and thinking ability, so that children can measure the area of an object through the initial perception of activities and convert it into the size of several units or the area and number of moving pieces. The whole activity went from shallow to deep, and the children were able to participate actively and were full of interest in the activity. Children have fully thought, explored and created when solving problems, and achieved the expected goals well.