Although the location information of Automatic Weather Stations (AWS) is the premise of accurate application of observation data, the location information of some stations is inaccurate due to many factors. According to the characteristics of AWS location information, a set of methods and procedures was designed for checking and evaluating AWS location information in the observation data. The accuracy of longitude, latitude and altitude in hourly data of 62 162 AWSs in January 2018 was verified. The results are summarized as follows: (1) stations with abnormal location information are all regional stations. (2) The error rate of location information is 4.8%; the probability of stations with abnormal altitude is greater than latitude and longitude, the error rate of altitude is 4.2% and that of latitude and longitude is 1.3%. (3) The main reason for location information error is the abnormal time variation, and the detection rate of time consistency check method is 94.9% and 74.5% for the latitude and longitude and the altitude, respectively. The integrated monitoring process of AWS location information is established based on MDOS, which can reduce the influence of location information errors on backend application.