China needs more cloud data in the icing meteorological conditions. The icing conditions in Appendix C of Part 25 of the Civil Aviation Regulations of China can only be copied from the American Aviation Regulations. There needs to have more research on the compliance analysis method of Appendix C for the icing cloud data obtained from flight detection. The icing conditions in Appendix C were formed in the late 1940s. The detection methods at that time were quite different from the data forms obtained by advanced detection instruments today. Therefore, the specific definitions of the icing conditions parameters in Appendix C are first clarified, and the data processing and analysis methods are studied according to the highresolution characteristics of the data measured by the current detection instruments. Finally, based on this method, the ice meteorological observation data of Anqing are analyzed. From the analysis results, this method can clearly show the basic characteristics of the icing conditions of the detected cloud and its compliance with Appendix C.