Karst constitutes one of the greatest landscape styles of the world and China is one of the places where its finest expressions can be seen. From the point of view of karst features and evolutional histories, and by comparative analysis on the three sites with worldwide similar karst areas under the eighth criterion of world heritage, the outstanding universal value is uncovered: Shilin stone forest in Yunnan is the most complicated in the evolution history richest in the forms,which represents a unique evolvement mechanism of stone forest development;which possesses not only the most typical karst cones, but also the most complex assemblages of the cone karst. Libo cone karst represents typical factors of cone karst landforms reflects geological evolvement models and processes in the tropical-subtropical continent; Wulong gorge karst shows integrally development and evolution system of the gorge karst, records evolutional forms of different phases of gorge karst, such as karst gorges, underground rivers, natural bridges, collapse dolines, caves and so on, and illustrats on-going evolution process on the neotectonic movement. As a result, south China karst (Phase 1) world heritage sites represent a long-term, multi-phased evolution history in south China since Paleozoic; the landform features of tropical-subtropical typical cone karst, stone forest karst and gorge karst; the development and evolution mechanism and on-going geological process of tropical-subtropical cone karst, stone forest karst and gorge karst landforms; and unique physical geography characters of the largest in the three vast karst areas in the world.