The electromechanical transient of doubly fed induction generation is built. The converter model that is the most time-consuming part is studied and simplified.The first kind of simplifying method was that the converters were simulated as a controlled voltage source, that forms the simplified model of electromagnetic;The second kind of simplifying method was that the generator/converter model was simulated as a controlled current source, that is electromechanical transient model, three different precision of DFIG models was finally formed.Using the PSCAD simulation platform, establish three different kinds of model, compares output characteristic of various models after the change of operation condition.Simulation results show that dynamic response of the built model is basically consistent with that of electromagnetic transient model. The simplified models have good accuracy and speed up simulation efficiency effectively.