In order to study the feasible mode of saline water irrigation in the downstream area of Yellow river, this paper carried out the experiments of saline water irrigation in the water-saving test base of Yellow River Institute of Hydraulic Research in Xinxiang of Henan Province. It adopted the method of combining pot experiment with theoretical analysis, studied the impact of different salinity saline water irrigation on sail salt accumulation and crop yield,put the dynamic change of water and salt, ET and yield into the water-salt production function, solved and analyzed the salt sensitive index in different growth stages. The result showed that if the salinity is lower than 3g/L, the decrement value of corn yield is lower than 6.4% and that of plant height is lower than 8.4%, there is no significant difference between these treatments and the check treatment; on the condition of 7g/L, the amount of decrement of corn yield is 20.9% and that of plant height is 9.2%, the salt accumulation in topsoil is evident higher than that of the check treatment; the sequence of salt sensitive index from large to small is seeding- jointing stage ,jointing-tasseling stage and tasseling-maturity stage, the corn in tasseling-maturity stage is most insensitive to salt, and the irrigation by saline water is most suitable in this stage. In summary, the salinity of saline water of lower than 3g/L is feasible for irrigation in the downstream area of the Yellow river, and the irrigation should be applied in the latter period of corn growth stage, but the irrigation mode in farmland and the impact of long-term use of saline water on soil and crop should be further studied.