Abstract: With the rapid growth of urban electric vehicle,the optimal planning of charging station has increasingly attracted widespread attention in the field of distribution network planning. The spatial distribution characteristics of urban traffic flow and operational constraints of distribution network are comprehensively considered,and public charging station optimization planning method is proposed based on the spatial distribution of traffic flow. Firstly,the unit model for urban traffic flow distribution is set up and sample space for urban traffic flow is constructed. Local traffic density is used to analyze the traffic flow within the service range of charging stations,distribution spacing is used to analyze the overall layout balance. Then,an objective function is constructed with the optimization of large traffic flow density around each charging station and balanced distribution of charging station stations. Combined with the analysis of urban traffic flow distribution and electric vehicle ownership,the charging capacity constraints are analyzed. Based on the charging capacity,the power grid operation flow and voltage offset constraints are analyzed. Clustering algorithm is used to search for local flow density and distribution spacing peaks,and optimization iteration is carried out to achieve the optimization planning of electric vehicle charging stations considering traffic flow. Finally,taking a planned area as an example,the effectiveness of this method is verified. It is proved that the method can provide a basis for the optimization planning of electric vehicle charging stations.