The current application of multi-sensor fusion technology in meteorological observation is mainly reflected in the temperature and precipitation multi-sensor. The formal operation of the multi-sensor reduces the manual maintenance workload of ground meteorological observation and ensures the integrity of temperature and rainfall data. In use, some problems in multi-sensor fusion observation were discovered. If these problems can be solved, the accuracy of temperature and precipitation observation data can be further improved, and the automation of all-round ground observation can be realized.