The thermal parameter measurements was carried out for vessel type green roof and bare roof in the airconditioned indoor environment in summer 2008 in Xiamen, China. The results show that temperature difference between internal surface of green roof and indoor air is about 1.5 ℃, and the heat flow from green roof is about 5.0 W/m the additional equivalent thermal resistance of vessel type green is larger than 1.0 m2·K/W.