Abstract: The north wall is a significant thermal storage structure in Chinese Solar Greenhouse,which could adjust indoor temperature.Low temperature during early morning in the greenhouse could prevent plants growth.So an effective method to increase indoor temperature in early morning was put forward in the study.Heat isolation curtain could adjust the wall's thermal flux.The practice in Beijing showed that the curtain covered on the north wall(sunny 16∶00-4∶00,cloudy 16∶00-3∶00) prevented 38.5% heat releasing in sunny day and 38.9% in cloudy day.After curtain taken off(sunny 4∶00-8∶30,cloudy 3∶00-8∶30),the amount of heat flux was 7.2% higher than CK greenhouse in sunny day and 13.5% in cloudy day,which meant the indoor temperature was 0.28~0.32℃ higher than CK greenhouse during whole early morning.

Key words: Chinese Solar Greenhouse, Chinese Solar Greenhouse, Heat isolation curtain, Heat flux, Thermal release controlling