Using the quality control information of metadata from 25 meteorological stations over Ningxia from 1951 to 2011, an analysis is made of the various contents of the metadata, such as the temporal distribution of the stations, especially observation instruments and the number of times of station moves. The results show that the number of times of observation instrument changes accounts for 896% in the total number of changes; the annual average number of times of observation instrument changes are 30 to 140 times as many as other changes. The main causes for the frequent change of the meteorological metadata include the scarcity of observation instruments in the early 1950s, the implementation of new standards, and the change of observation instruments. There were frequent station moves from 1951 to 1960, but it had little effect on the homogeneity of temperature, while the urbanization from 2001 to 2011 had obvious effect on temperature homogeneity. After the quality control of station metadata, the errors, the revised errors, and the rate of revised errors decreased. The metadata quality is improved significantly, and the meteorological metadata can be used to provide high quality service for meteorological scientific research.