Abstract: The variation characteristics of frozen soil in recent 49 years and frost free period in recent 55 years were analyzed based on the data collected from meteorological observation of Wuchuan County from 1960 to 2014. A general decreasing tendency of annual maximum frozen soil depth and a general increasing tendency of "non frozen soil period"and frost free period were observed in this study. Based on the data of first date of frozen soil, the last date of frozen soil, the first date of frost free period, the last date of frost free period and other factors, the variation characteristics of frozen soil and frost free period were detailed analyzed.