Nowadays the profile of integral shaped milling cutter is designed by diagram method. This method is low efficiency and bad precision. This paper deals with the application of conjugate surface theory to the profile design of integral shaped milling cutter. According to the structural characteristics of integral shaped milling cutter, the method for design of cutter profile to wood workpiece is investigated by use of conjugate surface theory. In the present study, the curve equations for integral shaped milling cutter profile are put forward, based on principles of coordinate transformation, mill cut mechanics and conjugate surface theory of differential geometry.