Abstract: A coordinated planning method based on hierarchical model and binary particle swarm optimization（PSO） was proposed to solve the problem of substation capacity and interval resource planning in power system.Firstly,the outer layer planning is carried out to improve the optimization of load cluster nodes in the substation.Then,in the inner planning,it optimizes the allocation of substation capacity and interval resources according to the association relationship between the same partition and cargo and load cluster nodes.Finally,it uses binary particle swarm optimization algorithm to obtain the optimal allocation scheme of substation capacity and interval resources.Experimental analysis shows that this algorithm can fully consider substation capacity isolation and utilize grid spacing resources,effectively improve the operation efficiency and reliability of power system,and has an important guiding role in power network planning.