Zhonggong Tunnel starts from the Huichang county, Ganzhou City, Jiangxi Province and terminates in Yudou County, Ganzhou City. It is provided with two holes and separation of up- and down-bound vehicle. The respective lengths of the left and right holes are 2085m and 2090m. The designed road surface elevation is 272.276m (entrance) ~230.981m (exit) for the left hole and 271.931m (entrance) ~230.874m (exit) for the right hole. The highest elevation of mountain top is 722.561m. The maximum relative elevation difference of the left line is 462.800m and that of the right line is 470.505m.