A field experiment was performed to validate the energy balance model described above and analyze the energy flows of typical extensive green roofs with Sedum plants. This field experiment was carried out on the Sedum lineare green roof (Fig. 2) installed on a research building of Building Environment and Energy Laboratory in South China University of Technology in Guangzhou, China. A sequence of 11 days of experimental data, from 11 July 2009 to 21 July 2009 has been recorded and analyzed