Abstract: Soil thawing-freezing process is one of the important environment characteristics in the seasonal frozen soil regions, and the dynamics of soil water and soil temperature influences ecosystem functions.Based on a longterm field experiment, the variations of soil water, temperature and electrical conductivity under conventional tillage, grassland and bare land were observed and analyzed during the thawing-freezing process in a typical Mollisols of China.Results showed that the dynamics of soil water, temperature and electrical conductivity was similar at daily and monthly scale during the observation period.In different freezing-thawing periods, soil temperature decreased in the order of thawing period, freezing period and frozen period.Soil water content in thawing period and freezing period was greater than that in frozen period, respectively.Soil electrical conductivity decreased in the order of freezing period, thawing period and frozen period.For different land use types, soil temperature decreased in the order of bare land, grassland and conventional tillage.During freezing period, both soil water content and soil electrical conductivity decreased was in the order of bare land, conventional tillage and grassland, respectively.During frozen period, soil water content decreased in the order of conventional tillage, bare land and grassland; soil electrical conductivity decreased in the order of bare land, conventional tillage and grassland.During thawing period, soil water content decreased in the order of grassland, conventional tillage and bare land; soil electrical conductivity decreased in the order of conventional tillage, grassland and bare land.