Abstract: In order to investigate the micro-climate characteristics in sunlight greenhouse of Hohhot in winter and to rationally regulate the micro-climate in sunlight greenhouse for local vegetable production,the meteorological elements of sunlight greenhouse with thick wall in winter were determined by micro-climate automatic monitoring equipment.Furthermore,the variations of air temperature,soil temperature in 10 cm, relative humidity and other micro-climate characteristics under different weather conditions（in sunny,partly cloudy and cloudy days） were analyzed,respectively,and comparative analysis on the variations of inside and outside air temperature were conducted based on the data collected by meteorological observation station in the same period.The results showed that in the sunlight greenhouse,the air temperature submits were all single waves under different weather conditions, with the highest temperature in 14：00 and the lowest temperature between 8：00 and9：00.The soil temperature in 10 cm submits were all single waves and the highest temperature emerged between 14：00 and15：00.The relative humidity submits were all opposite single waves,and the lowest value emerged in 14：00.It is indicated that the air temperature inside of sunlight greenhouse with thick wall in winter is obviously higher than that outside the sunlight greenhouse.Under different weather conditions,diurnal variations of meteorological elements inside of sunlight greenhouse were closed related to and consistent with the time of quilt opened and covered,and the same element had similar trend in diurnal variations in different days.