To fully grasp the evaporation duct characteristics and effectively support the application of radio systems in the South China Sea (SCS), we proposed a statistical method by using the remote sensing data and the numerical model. Specifically, three works have been completed: (1) The spatial-temporal database is established with about 0.2{degree sign}spatial resolution in the SCS during 2011-2020, and has the characteristics of large scope, high timeliness, long term, and high resolution; (2) The statistical distribution is analyzed that the height of evaporation duct is the highest during 12:00-17:00, a “Golden edge” with a height of 20m appears in the coastal area. (3) It is found that the northern coastal channel with a width of more than 300km was formed from May to July. Based on the above statistical results, the transmission loss was quantitatively analyzed that has the characteristics of “pipe adaptation” to different meteorological conditions. In the end, communication effects of 2FSK, BPSK, QPSK, MSK, 16-QAM, and 64-QAM by using the evaporation duct are analyzed, and a usable result shows that a 300km transmission in the SCS can be achieved under typical communication parameters in February. It is hoped that this paper can be further expanded to potentially providing a basis for support the application of the current radio system in SCS and explore a new effective means of communication.