Distributed PVs integrated in distribution network have various impact on its flow distribution. This paper analyzes the control principles of distributed PVs integrated in distribution network and establishes the model of typical low-voltage distribution lines with PVs integrated. For the same transmission line, we theoretically analysis the impact on load voltage of each point with PVs integrated in distribution network, then verify the correctness of the theory based on Matlab/Simulink and study the impact on distribution network with different outputs and different locations of PVs detailedly,finally give the measures and countermeasures of power quality PVs integrated bring.