Abstract: Due to limitations of land resources or environmental factors, construction of power facilities in high load region is often restrained by high investment cost and uncontrolled construction schedule. As a result, power supply capacity is not sufficient to meet the demands, which leads to the network congestion. To solve the problem, the comprehensive evaluation for energy storage planning to relieve network congestion is studied in this paper. Firstly, the comprehensive evaluation index system for energy storage planning is established on three levels: technical indexes, economic indexes, and construction indexes. Secondly, the particle swarm optimization (PSO) is used to optimize the charge and discharge strategy of energy storage, and index system is calculated according to the capacity and strategy. Finally, the weight of each index is calculated based on the combination of subjective and objective methods, to realize the comprehensive evaluation of energy storage planning scheme. The proposed model is simulated and verified on a practical power system in a high load area of the Guangdong-Hong Kong-Macao Greater Bay Area, which indicates that the method provides an effective reference for grid companies to develop energy storage planning, as a supplement and improvement for power grid planning.