The research on system reconstruction after blackout is of great significance for fast and safe system restoration. The hierarchical and partitioned restoration concept is elaborated from a new perspective

and a new system reconstruction algorithm is proposed based on hierarchical and partitioned restoration. The algorithm uses the way of stepwise searching optimization

and takes the balance of power and the importance degree of target nodes in the system restoring process into consideration dynamically. The topology of reconstruction network is integrally optimized in the hierarchical restoring process on the basis of ensuring the flexibility of the reconstruction plan

and the partition distance sensitivity index is introduced to provide quantitative references for effective coordination between different subsystems in the partitioned restoring process. The power flow constraints of the target system in each step are checked to ensure the feasibility of the reconstruction plan. The effectiveness of this algorithm is verified by the calculation results of an IEEE 118-bus system and the East China power system. This work is supported by State Grid Corporation of China.