Abstract: The micro-climate characteristics of greenhouse in the continuous cloudy days were analyzed,which was based on automatic weather station data in the greenhouse and meteorological data outside the greenhouse.The results were as follows, during the continuous cloudy days in winter, both the air temperature and the ground temperature in the greenhouse gradually were decreased.The temperature difference between in and outside the greenhouse was reduced.So did the ground temperature difference.The Relative humidity in the greenhouse showed periodic change.The value was high,which in and outside greenhouse gradually tended to be the same.The production managements should focus on keeping warm,increasing temperature,supplying illumination and enhancing stress resisitance.