Indication of soil water-salt dynamic laws is the premise and basis to reduce the saline obstacle factor. Soil water and salt content and its dynamic variation during the growing period of maize were investigated under field experiments with straw buried in different depths which were: no-straw treatment (CK), straw surface mulch (M0), straw buried in 40 cm, straw buried in 70 cm, and straw buried both in 40 cm and 100 cm. The results showed that, both straw surface mulching (M0) and deep burying (M1, M2, M3) could increase soil water content, which were 275.9, 280.3, 293.9, and 302.5g/kg respectively, increased by 3.7, 8.1, 27.1, and 30.3g/kg compared with the control in soil profiles during the growth period of maize. According to salt restraining, M0, M1, and M3 could effectively restrain the assembling of salt on top soil, with a reduction of salt accumulation rate—4.86%, 8.76% and 6.08% compared with the control; While M2 had a high salt content with soil salt accumulation rate decreased by only 2.9% compared with the control. So, straw surface mulching and deep burying could increase soil water content, restrain salt accumulation to top soil and thus have positive effect to improve soil salinization.