Abstract: The wide access of distributed power leads to the problem of the voltage limit of the distribution network, which greatly restricts the development of distributed photovoltaic. Taking Tianjin Jizhou distribution network as an example, this paper makes a theoretical and simulation study on the voltage overlimit problem of distributed power supply access to distribution network. Through the simulation analysis of single point and multi-point access, the 4 main factors of distributed photovoltaic access leading to the voltage overlimit of distribution network are determined, and effective countermeasures are formulated.