Abstract: In this paper,the experimental study on performances of vortex diode pump, including the lift height,the distribution ratio of liquid flow,the liquid conveying rate and efficiency, was conducted.The lift height was 6.7m.Experimental results were as follows: (1)The liquid height in the tank had little influence on the performance of the pump.(2)The suction pressure had little influence on the distribution ratio of liquid flow and lift height except for the efficiency and liquid conveying rate.(3) The lift height,the distribution ratio of liquid flow,the liquid conveying rate and the efficiency increased with the increase of the discharge pressure.(4) The distribution ratio of liquid flow is mainly determined by the ratio of static pressure drop around T tube.