Aiming at the extreme precision demand in the system of machining hard and brittle materials,a novel highprecision microadjusting platform which was driven by piezoactuator and transmitted and supported by flexure hinge.The leveling principle was discussed.The platform was analyzed and handled using the threepoint levelling principle,then the motion trail was discussed.The simulations of the platform were conducted by ABAQUS software,furthermore the levelling experiments were carried out on the microadjusting platform.The feasibilities of the levelling principle and the concept design of the platform were verified by comparing the simulation results, the experimental results and the theoretical results.