Ammoniation straw returned to find out the different amount of Shanxi medium saline-alkali soil water and salt factor, the influence of the growth characters and yield of corn, knick-knacks in 2018 in Shanxi Province has carried on the field experiment, the design of the four different ammoniated straw counters-field amount (1.2, 0.9, 0.6, 0.3 kg/m2), and there is no straw for field as the control group (CK), in the maize growth period on soil salinity, soil moisture content, maize growth properties index and yield are determined. The results show that the accumulation of soil salinity surface strongly presents the “plant” type, and the leaching effect of salinity in different treatment groups is significantly different from that of CK (P<0.05), which can create an environment with less salt for agricultural growth. Water retention effect becomes more and more obvious with the growth of crops, and the difference between treatment group and CK is significant (P<0.05). All the growth indicators show rapid growth in the early growth stage, gradually slow down and stabilized in the later growth stage, and the area index in the middle period show a trend of decline in the later growth stage. F1.2 and F0.9 in the treatment group has little difference in the impact on each index. Considering the benefits of water-saving and water conservation and yield, it is advisable to return 0.9 kg/m2 of ammoniated straw to fields in moderately saline and alkaline lands.