Abstract: Using daily temperature and precipitation data of 61 meteorological stations in Liaoning province from 1961 to 2020,the changes of the old and new climate averages for 1991-2020 and1981-2010 and the impacts on climate operations in Liaoning province were compared and analysed.The results show that:The average temperature,average maximum temperature and average minimum temperature increased from January to November;the largest increase in precipitation occurred in October to December.The average temperature,average maximum and average minimum temperature in annual and four-seasons all increased,from the mountainous areas in the east and west to the central plains,with the most significant increase in the central region;the average temperature and average maximum temperature all increased most in spring,with the average minimum temperature in summer.The annual,summer and autumn precipitation decreased,and the precipitation in spring and winter increased;the precipitation in July to August decreased,but the precipitation increased in the eastern mountainous area and the coastal area of Dalian.During late July to early August,the precipitation increased by 5%-6% in western and southern area,and the least in northern area.With the change of climate averages,the evaluation grade of average temperature and precipitation in four seasons all changed.