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This paper mainly studies on the resonant frequency and its influence factor on the resonator for wireless power transmission System based on resonant coupling (WPTRC). Using coupling mode theory, the mode conversion and work efficiency are analyzed. A cuboid film resonator is designed and the influence of thickness, length, strip width, gap between strips of outer conductor layer and length of inner conductor layer on resonant frequency are analyzed by simulation. The influence of inner conductor layer on resonant frequency is verified through experiment. The average difference between simulation and experiment is within 5%. The system efficiency is measured with different length of inner copper sheet and can reach above 40% within a distance of 15 cm.