There is little overwintering crops cultivation under the open air condition in the Dalian and other northern regions of China for its low temperature. Greenhouses can increase the environmental temperature, making it possible to introduce the Brassica campestris L., which is mainly planted in the south of China, into the north. This paper introduced the cultivation technique of intercropping Brassica campestris L. in winter and spring in Dalian,and analyzed its economic and social ecological benefits. The crops in Dalian are harvested twice a year, forming an efficient intercropping mode to improve the utilization rate of greenhouse land and facilities and increase planting benefits.