With the rapid development of modern multi-core and cluster technology, design of parallel computing to improve the efficiency has become one of the mainstream technologies. This paper puts forward a new method of node-based integration and hierarchical network topology in parallel. When in the normal operation of power network, using parallel fusion nodes adjacent table, to analyze static electric Island grid topology, electrical island adjacent to form and hierarchy. When the network topology changes, according to the attributes of the nodes and parallel depth first search method, it updates the local network topology and the electrical Island adjacency list. a practical network being analyzed by MATLAB's Parallel Computing Toolbox and the results prove the correctness and effectiveness of the proposed method.