Abstract: In order to carry out the forecast of temperature inside large-scale solar greenhouse, defense cold and heat harm of greenhouse vegetable, a large-scale solar greenhouse and its automatic observation system of microclimate were developed in the central region of northeast China, and the relationship between the outside temperatures and inside temperatures of the greenhouse were analyzed by using the microclimate data. The models to forecast the maximum/minimum temperature inside the greenhouse according to the outside temperatures were developed. The results showed that the relation of inside and outside temperature (maximum and minimum temperature) of large sunlight greenhouse was close significantly. The relationship varied in different seasons and weather conditions. Its related patterns could be used to forecast of minimum/maximum temperature inside the greenhouse, so as to enhance the level of greenhouse meteorological prediction and the preventive facilities of facility agricultural meteorological disaster, improve the vegetable production efficiency.