Abstract: in the use of automatic weather station observation related meteorological elements and gain popularity today, data recording accuracy improves gradually, but there are still many visual items by people＇s subjective consciousness influence. Artificial in determining cloud, cloud ＇s character is often not obvious, or in the course of evolution, in the similar condition, it is necessary to cloud made a comprehensive analysis, in order to accurately judge. This article from the cloud observation methods and requirements, evolution, shape features as well as with weather phenomenon summarize cloud identification.