Xishuangbanna Dai Autonomous Prefecture is one of the eight autonomous prefectures in Yunnan Province and the capital of Jinghong City. Xishuangbanna is located at 21/kloc-0'-2240' north latitude and 99 55 '- 10 1 50' east longitude, on the northern edge of the tropical zone south of the Tropic of Cancer. Xishuangbanna is the best-preserved tropical ecosystem in China, which is known as "plant kingdom", "animal kingdom", "biological gene bank" and "a jade in the crown of plant kingdom".