With the proportion increase of grid-connected distributed solar photovoltaic（PV） power generation

the security of complex distribution networks is facing new challenges. Therefore

this paper proposes an optimal PV configuration method of distribution networks based on node vulnerability assessment. Firstly

this paper puts forward the improved index set and a comprehensive evaluation method of node vulnerability based on the complex network theory. Secondly

a multi-objective programming scheme with minimum node vulnerability

minimum investment cost and minimum network loss is adopted

and the optimization model is solved by MOEA/D algorithm to obtain the optimal configuration set of distributed PV that meets various constraints. Finally

the effectiveness and superiority of the optimal configuration method are verified through instances of the IEEE 33 bus system and a supply area of the distribution networks.