This thesis intends to design a Third-class road in hilly Hilly area terrain is similar to the plain ,in terms of technical standards,technical indexes of the hilly area and plain area is roughly the In the design process,if it is as flat as a pancake, according to the direction of wiring it should be plain as the leading principle;if there are obstacles or should be on site,then add intermediate control points to search;in the steep slope zone, route should along the even slope Make the route a best entia in the flat,vertical,horizontal three Anyhow,highway design to ensure the principles on the economy, traffic safety ,passenger comfort and road beauty to aesthetic , according to the design speed, the expected traffic volume, topography and other natural In the design process, we should analyse influence of various factors and get the best project after careful comparison The design content mainly includes: the design of horizontal alignment, vertical section, cross section design, earthwork calculation, horizontal curve calculation, vertical curve calculation, high setting, pavement structure Keywords : hilly road; plane curve; vertical curve; super high; rock; pavement structure;