A field experiment was conducted under saline water irrigation with spring maize in Shiyang River basin of Gansu province. The soil water content and salt content were measured for study the effects of irrigation norm and salinity on soil water salt dynamic. The research results showed that irrigation norm and irrigation salinity both had obvious effect on soil water content. With the increase of irrigation norm and irrigation salinity, soil water content gradually increased. Irrigation norm and irrigation salinity also both had obvious effect on soil salt content. With the increase of irrigation norm and irrigation salinity, soil salt accumulation increased. After the spring maize harvest in comparison to sowing, the soil salt of every irrigation treatments was accumulated in addition to the fresh sufficient irrigation treatments in 0-100 cm. With the increase of irrigation salinity, soil salt accumulation increased. The 6 g/L deficit irrigation treatment had the largest salt accumulation and the maximum value was 0.838 g/kg.