In this paper， according to the trait of displacement monitor of N ATM and combined with the develop of modern instrument of measure，two new methods of diplacement monitor of tunnel are put forward “ the system of three—iimensional displacement monitor” and “ the arbitrary point system of peripheral convergence of tunnel”. The former， at one point， can provide the dependable informations of three— dimensional deformation for several sections of inspect in a short time. The latter， can provide the accurate informations of peripheral convergence of tunnel for several sections of inspect，and its working efficency can be improved distinctly than the conventional method.