The test procedures and result analysis of the comparative observation experiment on some present weather sensors at the Beijing Meteorological Observatory and Lushan Meteorological Service from December 2011 to June 2012 are described. There were three types of sensors tested in the 7 month experiment, each equipped with three sets provided by three manufactures. The experiment used the measurements from cameras aided by visual observation as the reference standards and tested the accuracy of these weather sensors in observing various weather phenomena. The results show that the data accuracy of rainfall phenomenon observations from these sensors is generally greater than 90%, which meets the needs of meteorological service; for precipitation intensity, the rainfall capture rate of these sensors is greater than 70% (rainfall intensity is greater than 0.01 mm/h), and for tracing precipitation (rainfall intensity is less than 0.01 mm/h) and mixed precipitation, the capture rate is relatively low; for low visibility phenomena, the observation accuracy is greater than 80%, which also meets the needs of meteorological service; and for other phenomena, more tests and improved algorithms are needed in future due to a relatively small number of samples.