Salt contents in soils different in cultivation age in Qitai County of Xinjiang were investigated for analysis of rules of the variation of soil salt content, types of soil salinity profiles and their affecting factors, using the cluster analysis method and some other related methods. Results show that along with the transformation of wasteland into farmland (at least 5 years in cultivation history), characteristics of soil salt content distribution in the soil profiles varied and fell into four types, i.e. surface accumulation profiles (SAP), even distribution profiles (EDP), oscillation profiles (OP) and bottom accumulation profiles (BAP). Uncultivated land high in salt content is typical of salinized soil, with an apparent phenomenon of surface salt accumulation; and the salt in the surface layer (0~20 cm) accounted for 34.31% of the tatol in the soil profile. Farmlands, 5 or 10 years old, are mostly of the type of BAP. With the farming operation going on and on, soil salt content in various salt-containing layers varied in activity degree showing an order of active layer (AL), sub-active layer (SAL) and relatively stable layer (RSL), and the relationship between soil salt content and soil organic matter content gradually turned from extremely positive one into extremely negative one, while the correlation between soil salt content and soil pH went the other way round. Under farming activities, soil salinization developed reversely. The average salt content in farmlands 10 years old was only 20.90% as much as in wasteland. The desalination rate was reducing with the farming operation going on from 0.156% a^-1 in the first three years of farming down to 0.004% a^-1 in the years beyond 5.