During the preschool years, the socio-emotional responses children receive from interactions with teachers are incorporated into their own social behaviors. This is one of the key ways in which children acquire social and emotional skills. Based on field studies, it can be found that this learning process is not simple imitation of children, but of a more complex context of group interaction. To further clarify the impact of kindergarten teachers’ emotion on the sociometric status and behavior of 3–5 year-old children (...) in their classes, the researchers chose a Montessori mixed-age kindergarten in Beijing as the field site and observed five classes within the kindergarten over a 2-month period in this ethnographic case study. The study found that the power gap between teacher and pupil spreads rapidly to all children in the classroom as a result of the teacher’s emotions, and even stimulates power stratification within the children. In addition, there are differences in the social behaviors between the children of different levels of power. As preschool children are in a critical developmental window when social knowledge is being accumulated and social skills are being acquired, using power relations within the kindergarten classroom as an entry point to analyze the impact of teachers’ emotions on children’s social behavior provides a new breakthrough for the professional development of early childhood education and the better achievement of educational goals. (shrink)