Abstract：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.
2000, Vol. 17 
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