On the basis of analyzing the difficulties of RFEC used in detecting non-magnetic plate, the remote field effectiveness is formed on an object of flat geometry by using a type-U component. The principles of optimization design are obtained through analysis of the influence of materials of the UTC, the length of the UTC and the thickness of the UTC. The research of this paper is of some important theoretical meaning and practical value for promoting the application of the RFEC technique and to the detection of the nonmagnetic metal plate.