Broken window theory: The window of the house was broken and nobody repaired it. Soon, other windows will be broken inexplicably; A wall, if there is some graffiti that is not cleaned up, will soon be covered with messy and unsightly things; In a very clean place, people are embarrassed to throw rubbish, but once there is rubbish on the ground, people will throw it away without hesitation and feel no shame. Application in education: 1. If individual students in the group have problems, correct them in time. Collective influences individual, personal influence collective. 2. If individual students have some problems, they should pay attention to them in time to avoid enlargement. Prevent micro-duration 3. It is easy to produce the psychology of decentralized responsibility.