Precipitation phenomenon is one of the important meteorological indexes, and the accuracy of its observation data is of great significance to meteorological forecast and related fields. There are obvious differences between the observed data and the observed data. Comparing the observed data with the observed data of Guiyang National Reference Climate Station, the results show that: 1) the observed data can observe all the precipitation types, but there are many types of rain and precipitation in drizzle, which is quite different from the observed data; 2) Compared with the recorded data, the observed conditions of hail by the observed data have some limitations, and there is a phenomenon of omission; 3) The observed results of the observed data are poor and the omission is serious; 4) The observed results of the observed data are poor and the omission is serious.