Abstract:To evaluate quantitatively the suitability of microclimate in greenhouse for the growth and development of vegetables and increase the connotation of facility agriculture meteorological quantitative service, this paper sets up four suitability degree models of inside air temperature, air relative humidity, solar radiation and three factors integrated microclimate in cucumber solar greenhouse are respectively based on the observation data and the results of previous studies and thus the correlation between cucumber actual yield and suitability degree of the models are verified. It is concluded that cucumber yield increases with the increase of integrated suitability degree, and they two are significant correlated. This means that the model for analyzing the suitability of microclimate for cucumber growth in greenhouse is reliable. From the application of the models it is found that the most appropriate time is May in which the microclimate in greenhouse contributes to the growth and development of cucumber well while the most unsuitable time is January. Regardless of temperature suitability, air relative humidity suitability, the received solar radiation suitability or three factors comprehensive suitability, the varying trend of its values is irregular “V” shaped during the whole observation year. The spring suitability degree is the highest, followed by the autumn, and the lowest in winter. The calculation result is in line with the local actual situation.