Mechanically-clamped milling cutter is mainly used to process wheel trough of nuclear power. For reducing cost and accruing benefit, a mechanically-clamped milling cutter is developed which cutter body is reused. Insert pocket decides reference location of cutter body and shaped conductor of milling cutter. But the measuring to insert pocket is complex and measuring efficiency is low.And it is required that measuring accuracy must be guaranteed on the premise of guaranteeing measuring productivity. Based on Leitz Reference 600, insert pocket was measured in three coordinate measuring machine. The measuring difficulties were anatomized and measuring bottleneck was resolved.So the work efficiency is raised greatly.