To reveal the effects of zinc application on the maize growth and zinc morphological changes in saline fluvo-aquic soils in Hexi oasis area，and the effects of exogenous zinc application on the plant height，dry weight，zinc content，zinc uptake of maize，and the contents of various form zinc in the soil under different salt concentrations(mild，moderate and severe)were simulated by pot experiment. The results showed that under the same salt concentration，zinc application of 10 mg/kg increased the plant height，dry weight，zinc content，zinc uptake of maize and the content of soil available zinc by 8.5%-21.6%，21.7%-333.3%，107.3%-154.7%，166.7%-965.9% and 451.3%-547.2%，respectively；and the zinc contents of carbonate bound state，loose organic state，manganese oxide bound state，amorphous iron oxide bound state，crystalline iron oxide bound state and residual mineral state in the soil increased by 147.4%-173.3%，122.4%-152.1%，11.6%-12.6%，32.6%-33.4%，17.6%-18.0% and 3.1%-3.2%，respectively. Under the same zinc application condition，with the increasing of soil salt concentration，the plant height，dry weight，zinc content，zinc uptake of maize and the content of soil available zinc decreased by 6.5%-36.4%，12.8%-89.9%，5.5%-22.0%，17.4%-92.2% and 4.8%-18.1%，respectively；and the contents of carbonate bound state，loose organic state and manganese oxide bound state in the soil decreased by 4.7%-15.0%，3.6%-13.7% and 10.4%-25.6%，respectively；while the contents of amorphous iron oxide bound state，crystalline iron oxide bound state and residual mineral state in the soil increased by 1.9%-5.8%，0.4%-3.5% and 0.6%-2.2%，respectively. All the results indicated that in the salined environment，the main reasons why zinc application could improve the growth status of maize were that it greatly increased the contents of two effective zinc forms，namely，CAB-Zn and WBO-Zn，improved the zinc nutrition level of the soil-crop system in the short term，and improved the salt tolerance of maize.