At present, the rate of active and continuous occurrence of children's cooperative behavior is low, while the development of children's cooperative behavior can be shaped through product design. Through such methods as observation, in-depth interview and questionnaire survey, the needs of children, teachers and parents were investigated respectively. Combined with child development psychology, the difficulties of preschool children's cooperative behavior cultivation were summarized and the solutions were put forward. Furthermore, the market research of behavior cultivation related products was carried out, the product design positioning was produced, and the game design was carried out combined with the investigation and ranking results of mechanism elements and construction elements. Moreover, through the octagonal behavior analysis framework, the product information architecture is analyzed and optimized, and then the product UI interface design and preschool children classroom interactive robot design are carried out. The game design process based on DMC was constructed, and the game design of cooperative behavior formation system for preschool children was completed, which was approved by the test. In conclusion, the design scheme is tested by users, and the optimization scheme is put forward according to the evaluation results, so as to verify the feasibility and effectiveness of the game design process based on DMC in the design of preschool children's cooperative behavior development system.