Selection of the xerophils and drought tolerant plants is highly crucial in green roof techniques in longer drought regions in Northwest China. In the current study, the thermal performance under natural conventional climate in summer was analyzed using the self-made simulation experiment platform through comparison of internal surface temperature with and without green roofs. Distribution frequency of internal surface temperature was investigated by dividing internal surface temperature into several ranges. Statistical analysis showed that the frequency of internal surface temperature lower than 33 °C for green roofs was 91.8%, about 1.09 times higher than that for non-green roofs, and that the sum of internal surface temperature exceeding 35 °C was about 1/3 of that for non-green roofs. The results proved that green roof has a significant insulation effect. Moreover, the thermal insulation property of green roofs had a strong positive relation with outside temperature. The thermal insulation characteristic was improved as the outdoor temperature increased.
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