On the basis of climatic and ecological characteristics of greenhouse flower planting,the analysis system of meteorological conditions for flower planting in greenhouses in North China was developed with the VB-language.The system consists of five subsystems: climatic and ecological index base,microclimatic element model base,microclimate-control knowledge base,indoor microclimate analysis system,and system maintenance module.Once the numerical values of the greenhouse type,flower variety,season and weather parameters were put in,the system would put out automatically the microclimate parameters of the greenhouse,determine whether the conditions are suitable,and provide suggestions about technical measures for greenhouse microclimate control.