The flow field model of port plate pair in condition of the linear axial pressure distribution and dynamic model of flow divider pintle supporting system in abruptly variable load were established. Based on the two models, the balancing characteristics of flow divider pintle in ball piston pump was investigated. The results show that the flow divider pintle supporting system has a closed loop adjusting effect with pressure feedback. The flow divider pintle returns to the balancing state with a zero eccentricity under the pressure feedback and has no overshoot. It provides theoretical basis for designing flow divider pintle in ball piston pump with high efficiency and lays a foundation for further study of ball piston elements with high power density.