Proposed in this paper is a new equivalent modeling method of external network considering voltage sup- port.Firstly,on the basis of short circuit information of all external network boundary nodes obtained by multiple fault simulation with Power System Analysis Software Package,an equivalent model of external network in the form of current source branch is established.Secondly,in order to overcome the errors of boundary node voltages due to the ignorance of internal network,the model is converted into a model in the form of Thevenin impendence branch.Then,a potential correction method,which takes actual steady-state voltages as the expectations in equivalent power injection branch,is proposed.The modified equivalent model on the basis of boundary node information can ac- curately reflect the voltage support of external network.Finally,by taking Ningxia regional new energy power grid for example,two external networks respectively with long chain-type and ring-type internal networks are modeled.Simulated results verify the validity and accuracy of the proposed modeling method.