Abstract: With the development and increasing application of geological remote sensing technology, a large quantity of research and surveying results have been achieved in various fields of geological investigation.Nevertheless, there are not uniform legends for geological maps.To some extent the lack of the standard legends for geological maps has long affected the width and depth of geological remote sensing investigation.Based on the establishment and development of the principle of legend, the authors analyzed the main content and expression form of the legend, discussed the different categories of legend arrangement and expression method, and the generation of the legend.The results show that it is very necessary to design and automate the standard legends for geological map interpreted through remote sensing image.The standard legends will meet or exceed our requirements and provide technical support for standardization of remote sensing geological maps.