Abstract: The resources of blue flowered plants of Yunnan Province were studied,and their systematis and evolution were discussed.The ecological factors such as ultraviolet sunlight were focused to induce the formation of blue flowered plants of Yunnan and the authors concluded that more than 408 species of blue flowered plants are habitating in Yunnan Province,which belonged to two big groups of dicotyledons and one group of monocotyledons.For their geographical distributions,the authors found that northwest part of Yunnan Province is the center.