Abstract: The temperature and energy-saving in multi-span greenhouse with simple inside thermal screen was studied.The results show that the simple thermal screen can postpone the time of starting up heating facilities for about 14 days in early winter,increases the temperature by 2.65℃ at 7:00 in comparison with the double inflated plastic greenhouse and saves 6250.5g/m²·d coal,with the energy saving rate of 38.24%.After starting up the heating facilities,the simple thermal screen increases the temperature by 2.16℃ at 7:00 in comparison with the PC greenhouse and saves 70g/m²·d coal,with the energy saving rate of 11.84%.In the greenhouse with the simple thermal screen,the illumination decreases,better than that in the double inflated plastic greenhouse and PC greenhouse.