The transitions of land surface freeze/thaw status indicate the dormancy and activeness of land surface processes,like a switch controlling hydrological cycle and ecosystem activity.This paper introduced two datasets of long-term land surface soil freeze/thaw states of China based on dual-indices algorithm and decision tree algorithm Covering the period from 1978to 2015and from 1987~2009respectively.Both datasets can be used to derive the distribution and trend of onset of surface freeze/thaw status,frozen period, the number of frozen days and frozen extent over China,the information is useful to support cryosphere and hydrology related research,and climate change analysis.Both datasets can be accessed forfree in Environmental and Ecological Science Data in West China(http://westdc.westgis.ac.cn).