With the rise of community marketing, understanding consumers’ behavior in the community environment is particularly important for the development of the enterprises and community economy. Based on the theory of environmental psychology, this study builds a consumers’ decision-making model of impulsive buying in community marketing environment from the perspective of the community climate. By using the structural equation modeling, we discuss the impacts and mechanisms of different dimensions of community climate, namely community interaction climate, community control climate, product assistance climate and sales on-the-spot climate on the consumers’ impulse buying. The findings show that the four dimensions of the community climate have a significant influence on the sense of community, while the sense of community plays the mediating role in consumer impulse buying. Specifically, the sense of community plays a partial mediating effect on the relationship between the community control climate and impulsive buying, and plays a fully mediating role between the other three dimensions of the community climate and impulsive buying, and then it displays the intrinsic mechanism of the effects of community climate on impulse buying.