The histories of early automatical weather stations in Guangxi are usually less than 7 years, and most of the stations are distributed on hills with different height. Because the data time series is too short, the climate threshold directly calculated with the observation data from this station cannot be representative of the station’s climate threshold range accurately. The altitude correction method is used to solve this problem: selecting the adjacent country stations as the benchmark stations and finding out the climate thresholds of reference stations; making altitude correction to the benchmark station climate thresholds according to the changes of temperature, pressure, and wind speed with the height correlation methods and getting the automatical weather station climate thresholds. The results show that the climate thresholds of the elements are more representative and more applicable after altitude revising. This method has been used in the real time data quality control system of automatic weather stations in Guangxi and achieved very good results.