After the recent adjustment of message transmission mode of the surfer observational data, it is necessary for observers to pay attention to the data acquisition on the hour of automatic weather stations and the accuracy checking up of the data processed by the OSSMO software. Taking some representative examples of the abnormal data, the analysis and processing of the abnormal data are conducted to help observers identify skeptical surface observation records quickly in daily data maintenance and to complete the quality control of automatic weather station data, so to ensure the integrity, timeliness and quality of surface metrological observation data.