In order to improve the situation of voltage viola.tion in distribution network with high penetration distributed photo.voltaic(PV)system, it is possible to fully utilize the reactive powerregulation ability of grid.connected PV inverter.This paper proposestwo kinds of strategies on distributed PV generation output regula.tion for node voltage violation of medium.low voltage level distribu.tion network.For the first method, each PV node’s voltage sensitivi.ty to its injected reactive power and active power is obtained usingdisturbance.observation method.The available reactive power out.put of the most effective PV access node is calculated and when itsreactive power is not sufficient, its active power is able to regulate.For the second method, aiming at both regulating voltage violationand minimizing the grid active power loss, the reactive power and ac.tive power of all the PV generation systems are optimized from theperspective of global optimization.Through the simulation of IEEE33 nodes distribution network under two typical kinds of operationscenarios, in comparison with the voltage reactive power active pow.er PV output mode, the validity of both methods are proved.