Abstract: Putting the growth of plants, environmental control and economic analysis of greenhouse in a lange scale system, the comprehensive dynamic model of gneenhouse was developed. The model was constructed basing on three sub-models and the relationships among the rate of photosynthetic, environmental control and control cost. The “decomposition-coordination” method of large scale systems cybernetics was employed to solve the question of the overall optimization of greenhouse systems, and optimum means of comprehensive environmental control under different external climate conditions is obtained while better control and lower cost are simultaneously gained.