In order to grasp more accurately the parameters impacting the lifting performance of multiple-tube bubble pump and improve the performance of Einstein refrigeration cycle,the paper established the theoretical model of multiple-tube bubble pump and studied the effect of multiple-tube bubble pump on its lifting performance by experiments.It analyzed the influence of riser number on the amount of liquid lifting volume and the lifting efficiency of bubble pump. It is found that the trend of test data is basically consistent with the theoretical values. Compared with the single bubble pump,the increase of riser number does not bring to the corresponding rate increase of lifting capacity and lifting efficiency with the same heating power on each riser. When the heating power is less, the efficiency decreases with the increase of riser number.With the increase of heating power,the more the number of riser tube, the more the efficiency become .