Adopts the closed sampling method and thermal desorption-GC-MS analysis, Through testing and researching the VOCs released by the three important urban green grass: ryegrass, Kentucky bluegrass and tall fescues, with reclaimed water and clean water irrigating, we can find out the discipline of the VOCs released by the three typical urban green grass and the potential impact on the growth of plant with reclaimed water irrigating. The result shows that, the main VOCs released by the plant under the irrigating of reclaimed water and clean water have the same categories, including the terpenes, the alkanes, the aldehydes, the alcohols, the esters, the acids and the ketones, and have no distinct difference in the discharge amount. Therefore, we can conclude that, it has little impact on the VOCs released by the plant with the reclaimed water irrigating, and it's feasible to irrigate the urban green space with the reclaimed water.