The Automated Weather Phenomenon Observation System can observe condensation and record the occurring time of weather phenomena by using image identification technology. The time of condensation occurrrsing and the data of soil moisture in the shallow soil layer are analyzed, and the relationship is established by using the data of the automatedic present weather observation system and the soil moisture observation equipment installed at Pinggu Station in Beijing from April to September in 2011 The condensation phenomenon appears earlier when the soil moisture of 0 to 10 cm layer is higher. On the contrary, the condensation phenomenon appears later when the soil moisture of 0 to 10 cm layer is lower, and the condensation phenomenon does not appear when the soil moisture of 0 to 10 cm layer is too low. In order to everify the the certain relationship between the condensation time and soil moisture, the relationship between the condensation time and the number of days after the rainfall in Huairou, Mentougou, Chaoyang, Daxing, and Yanqing stations of Beijing are analyzed.