In order to alleviate over-testing in traditional acceleration-controlled vibration tests, we established an electromechanical coupling dynamic model of a shaker system using a combination of structure dynamic and electromagnetic dynamic equations. We obtained the mapping relationship between armature current/voltage and interface force, then proposed an indirect measurement test program of interface force to validate the correctness and effectiveness of the proposed method. This method of interface force was more convenient, in that it avoided the need to change the interface conditions and was a useful supplement to traditional force measurement devices.