A realtime weather monitoring and prediction operation oriented software for quality control over automatic weather station (AWS) observation data is introduced. The software makes comprehensive use of data quality control method and instantmessaging technology, brings data quality control into meteorological information operation flow and thus a provincecitycounty three level realtime quality control operation flow over AWS observation data is built. The observation data from 89 national AWS and 1531 regional AWS in Jiangxi Province are under realtime quality control. The adverse effect on weather monitoring and prediction casued by AWS questionable data is effectively reduced.