In recent years,Smulti-coreSand multithreadSprocessing technologyShave developed rapidly, making full use of CPU resources and using asynchronousSprocessing technologySare effective ways to improve the computational efficiency of network topology analysis in the power system.SThis paper presents a method for analyzing theSsequence networkStopologySbased on multi-taskSasynchronous processing. In this paper, electrical componentsSare abstracted asSthe type of node and branch, and we establish the connectionSclass to saveSconnection information,Sthe way that we deal with the topology analysis ofSpositive and zero sequenceSnetworksSis using asynchronous processingStechnology.SBased on the nested-taskSmodel we can deal with the form of the nodeSimpedanceSmatrices which are long-time work inSsequenceSnetwork topology analysis by dividing them into fourSindependent subtasks. Finally, the program will generate topology network diagrams and the data of analysis results. Topology analysis of a certain Sichuan power grid showed the feasibility and efficiency of this method.