Long Yong expressway is an important part of Hunan's "seven vertical and nine horizontal" highway network planning. It is a northward and outgoing provincial highway crossing Xiangxi Autonomous Prefecture. The line is full of 91.086km. J2 supervision office supervision 6-10 standard 13.3km (main line), pile number K23+700~K37+000. The main line is constructed according to the bi-directional 4 lane highway standard. The design speed is 80km/h, and the width of the subgrade is 24.5m.