Combined with the characteristics of children in Winter cities and based on the study of children's behavioral psychology in cold regions, the work aims to put forward the main problems faced by the construction of urban green space in winter cities and discuss the optimization strategy of urban green space under the impact of extreme climate. By analyzing the children's behavioral psychology in winter cities, the relationship between urban green space and children's behavioral psychology in winter cities is summarized. The problems faced by children in cold cities in using green space are analyzed from two aspects, including the lack of climate adaptability of green space, which limits children's behavior and the lack of characteristic space in green space, which can not meet children's psychological needs. The study promotes the physical and mental health development of children in winter cities by improving the comfort and safety of green space in cold regions, enhancing the seasonal adaptability of cold space and optimizing the functional design of urban green space in cold regions, and provides theoretical basis and practical guidance for the planning and design of child-friendly green space in winter cities.