The Longtan tunnel which is being constructed is the second longest expressway tunnel in China by now. The stratum of the tunnel is complicated. And there are bad geological conditions such as partial press
karst
fault
high in-situ stresses and so on. In the paper
some key technologies are simply introduced; and some measures are presented to solve the possible problems during the progress of construction of the ninth bid. These measures can ensure the quality and the time limit for the project.