To further improve the impact of vibration and noise on balanced high flow axial motor piston pumps，the mechanical vibration transmission path was built,the characteristics and laws of mechanical vibrations generation and transmission under the action of excitation forces were analyzed.The results show that:the balanced motor piston pump vibrates most violently under the excitation force,and the vibration process gradually converges and decreases from the transient response stage to the steady-state response stage.The maximum resonant frequencies of the discharge port end cover,suction port end cover and outer casing are 4 104.1 Hz,2 577.58 Hz and 2 602.6 Hz respectively,and the maximum co-vibration amplitude values of 6.82 m/(s2·Hz),6.24 m/(s2·Hz) and 3.7 m/(s2·Hz),respectively.The balanced double swashplate construction provides significant vibration and noise reduction compared to ordinary motor pumps.