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To grasp the observability of weighing gauges for liquid precipitation and promote the automation of precipitation observation, a statistics analysis is carried out on the precipitation processes occurred in the spring and summer of 2011, and a comparison is conducted between DSH1 and SL3 1 sensors at Beijing Weather Observatory on the characteristics of precipitation dada. The results show that the data obtained from DSH1 are basically as reliable as SL3 1，and the differences of data between the two sensors are negligible during light rain processes, but cannot be neglected during moderate and heavy rain processes. Since failures of DSH1 were found out during use, the reliability of the instrument still needs to be improved.