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Hysteresis and power consumption characteristics of Fe-Ga alloy is the basis of working efficiency study of magnetostrictive transducers. Based on hall effect and Faraday's law of electromagnetic induction, a set of automatic testing system for magnetic properties of magnetostrictive materials was designed. By using the automatic testing system, the magnetic hysteresis curve of Fe-Ga rod alloy was tested and analyzed under different magnetic field frequencies and magnetic induction intensities. And coercive force and remanence were increased when the magnetic field frequency and magnetic induction intensity were increased respectively. By the hysteresis curve of the same magnetic induction intensity under different magnetic field frequencies, electromagnetic losses and energy storage medium were calculated. Simultaneously, electromagnetic losses were separated into three main parts of hysteresis, eddy current and residual loss. It was found that when magnetic induction intensity was 1725mT and magnetic field frequency was increased from 30Hz to 70Hz, electromagnetic loss and energy storage medium were increased by 3.24 times and 1.96 times respectively as well as hysteresis, eddy current and residual losses which were separated by electromagnetic loss respectively were increased by 1.33 times, 5.26 times and 7.35 times. The proportion of hysteresis loss was fallen from 56.87% to 31.31%, the proportion of eddy current loss was risen from 32.98% to 48.69%, and the proportion of residual loss remain unchanged. For the high-frequency working conditions of Fe-Ga gallon transducer, the treatment of slicing Fe-Ga rod alloy was made to reduce the eddy current loss and improve the efficiency of Fe-Ga gallon transducer.