Tianmen Mountain uplift began in Yanshan movement, and then through the Himalayas mountain orogeny movement, the mountain is violently raised more than a kilometer, and the surrounding is deeply cut by the fault jointing, plus the long-term wind and rain erosion of karst, resulting in a high stand, the karst platform type landform. Its mountaintop is relatively flat, preserving the complete primitive secondary forest, with many extremely precious and unique plant varieties