Some calibration methods needing improving and adjustment methods of overproof sensors in the AWS are discussed. The various overproof sensors were adjusted while the calibration methods have been improved in the recent 2 years in 74 calibration cases of various sensors, such as temperature and humidity, wind direction and velocity, pressure, rainfall,and evaporation sensors. The result shows that it is necessary to improve the temperature, wind direction and velocity sensors and reduce the overproof errors by adjusting various sensors.