This paper took the vegetable greenhouse soils in Taicang suburban area as the study objects, measured the total salt contents and ion compositions, and analyzed the accumulation and change of soil salinity. The results indicated that total salt content in soils was 3.38 g/kg and reached mild salinization level. Soil salt accumulation showed great difference in regional distribution, the minimum and maximum values of total salt content in soils were 0.42 g/kg and 12.6 g/kg, respectively, and with the variation of 65.7%. The salt contents of 69.84% of soils were above the safety standard, among of which, 51.59%, 10.32% and 5.56% of soils were in mild, moderate and severe salinity grades. Regionally, the salinization in LiuHe Town, Shaxi Town and New District were more serious, in which the proportions of saline soils were of 91.4%, 91.0% and 91.4%, respectively. Among ion composition of soil salt, cation was given priority to Ca²⁺, followed by Na⁺ and K⁺, and anion given priority to NO₃^-, followed by Cl^- and SO₄^2-. Correlation analysis showed that the main influential factors of soil salinization in Taicang were the total salt content, NO₃^-, Cl^-, Ca²⁺, and so on. The main reason for soil secondary salinization were human activities, such as unreasonable fertilization, cultivation and management. Total salt content in soils increased significantly with the increase of greenhouse-planting time, which reached maximum (with a mean of 3.64 g/kg) in the year of 4 -5 years, which was 1.29 times of that with one-year greenhouse-planting.