Based on daily maximum and minimum temperature data of 234 stations in China during the period of 1955-2005,the spatial and temporal features of trends of annual and seasonal extreme temperatures are studied by using modern statistical diagnostic methods such as the computation of trend coefficients.Results show the stably increasing trends of annual and seasonal extreme minimum temperatures all over China.Decreasing trends of extreme maximum temperatures are obvious in the lower reaches of the Yellow River in year,spring and summer;while increasing trends of extreme maximum temperatures are evident in South China.Increasing trends of extreme temperatures are detected in most areas of China,and the increase range of extreme minimum temperatures is greater than that of extreme maximum temperatures.Increasing trends of extreme minimum temperatures are found in every season,especially in winter.Further analysis suggests that interdecadal variations in extreme maximum and minimum temperatures are generally consistent.