Rapid urbanization not only causes the decrease in acreage and type of natural soils but aslo leads to changes in soil functions which demonstrate in variation of land use.A case study of Zhengzhou City was carried out to probe evolution characteristics of soil functions during the urbanization through urban sprawl and land use variation.Results indicate that with the development of urbanization,great changes are taking place in land use structure.And as a result of the expansion of the built up area in acreage,the soil group,like Paddy soil,and the soil subgroup like salty Aquent have disappeared,and so have other 2 soil genera and 11 species and some specific soil functions as well in the past 20 years.With the steady progress of soil alienation,the soil is changing its functions mainly from production and ecological buffer to load bearing and secondly from ecological buffer to production.Such transformation of soil functions not only bring out pressure on regional agricultural production and food security,but also cause unnegligible impact on the ecological environment and human health of the region.