Abstract: A multi-nozzle jet pump was designed which can shorten the length of throat pipe according to the problem of the traditional single-jet pump with a longer throat pipe, which restricted its application range. The jet pumps with different structural parameters were simulated numerically and experimentally studied using k-ε model and wall functions. The results showed that the number of nozzles and the length of nozzle-spacing had a great influence on working performance of jet pump; turbulent kinetic energy was greater in suction chamber and inlet of throat; the number of the best working performance was obtained; the length of throat in which operating fluid and the drawn liquid was well-mixed was determined. That jet pump could shorten the length of throat pipe was verified, which could enhance the engineering value of jet pump.