Acorus calamus Linn were cultured with synthetic water of naphthalene contamination,the growth,leaves chlorophyll contents and MDA contents were analysed. The results showed that: Naphthalene contamination may inhibit the height and biomss increment of A. calamus,stimulate chlorophyll contents of leaves in the short term,and increase MDA contents of leaves. Naphthalene contamination affects the growth of A. calamus Adversely.