[摘　要]　基于华盛顿一个2000m2绿色屋顶对于降水截留、节能、净化空气的环境效益进行分析，并与传统屋顶的投资花费现值（PV）进行对比分析，结果表明，在华盛顿政策条件下，40年后绿色屋顶的投资花费现值（PV）要比传统屋顶低25%~39%，同时绿色屋顶的投资回收期最短可以达到8年。

[关键词]　绿色屋顶；现值（PV）；投资回收期

Abstract: The paper evaluates stormwater retention, energy savings, and air quality benefits for a 2000m2 green roof in Washington D.C., and incorporates all these benefits into present value （PV） analysis. The results demonstrates that PV of green roofs is 25%～39% less than that of conventional roofs. The return period of investment of green roof is expected to be 8 years under Washington D.C. policy scenarios.

Key words: green roof; present value（PV）; return period of investment

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