Abstract: To address the impact of high-proportion renewable energy integration on distribution networks, this paper proposes a hosting capacity assessment model considering power quality, relay protection, and equipment thermal stability, and constructs a bi-level planning method with energy storage coordination. An improved PSO algorithm is used to solve the model. Verification on a 45-node system shows energy storage configuration increases renewable energy hosting capacity by 21.86%, providing quantitative decision support for new power system planning.