Abstract: In this paper, the basic situation of distributed PV access to the distribution network, the impact on the power grid, large-scale access and security problems caused by the operation of the distributed PV access and management measures to explain the impact of distributed PV on the power grid. The key problems caused by distributed PV large-scale access, such as grid connection, standard access, "Observable and controllable", on-site absorption, safe operation and Operation Security, are analyzed.