In the paper,Four kinds of maize seeds were treated by different salinity density,and the effects of salt stress on seed germination and seedling growth of maize were studied.The results showed that,different salinity density had different inhibition effects on the germination rate,plant height,chlorophyll content and root activity,different variety had diversely expression.k Dongdan 14 was the most salt-tolerant kind,and Fuyou 9 was relatively weak.