There are many kinds of children's violations.During the three- month internship, I observed the 1activities of the children in class and recordedthe violations. In order to understand the reasonsfor children's violations, I use language that L canunderstand and without affecting children'semotions, The author talked about the violationsof the children in middle class, and learned thereasons of the violations. Meanwhile, the authorinterviewed the teachers in real time. Based onthe results of interviews with children andteachers, the author concludes that the reasonsfor the llegal behavior in middle class children 1are as follows.