The south bank of Laizhou bay was selected as the research area，the total salt content of soil was determined and 111 surface soil samples systematically，the contents of K+，Na+，Ca2+，Mg2+，Cl-，SO2-4，HCO-3 and CO2-3 were analyzed，and the contents of salt ions were measured. The influencing factors of soil salinization on the south bank of laizhou bay were analyzed by means of multivariate statistical analysis and geographically weighted regression model. The results showed that: the soil in the study area was dominated by salt soil，and the concentration and variation coefficient of Cl- were much higher than that of other salt ions. The accumulation of soil surface was very significant，and the most active chloride was in the soil; Soil moisture content，dry bulk density，soil organic matter，vegetation coverage and soil salinization degree were highly correlated，and the fitting accuracy was high; There is a moderate correlation between temperature，precipitation，groundwater depth and groundwater salinity，and the fitting accuracy is high; DEM(digital elevation model)，height difference，soil particle size and soil pH showed a general correlation，and the fitting accuracy was general.