Abstract: The device performance characteristics of transformer type pulsed liquid pump device were experimentally studied.The effects of the area ratio,work pressure and pulse parameters on the performance of the pulsed liquid jet pump device were performed in the tests.The potency of pulsed jet on improving the performance of the liquid jet pump device was also studied through the comparison with invariable jet pump at the same conditions.The results show that the pulsed jet can significantly improve the performance of transformer type jet pump devices.Area ratio and pulse parameters are the critical factors to the performance of the pulsed liquid jet pump device.The jet pump device performances are significantly improved by reducing the area ratio or by increasing the pulsed frequency.The flux characteristics of the pulsed liquid jet pump device presents the typical negative linear,the potency of pulsed jet in improving the performance of jet pump device with small area ratio can be more significant.The efficiency curve of pulsed liquid jet pump is similar to the parabola.At higher pulsed frequency,the top efficiency point of the pulsed jet pump moves to the higher flow ratio.The high efficiency area of the pulsed jet pump also is widened with the increase of the pulsed frequencv.