With the penetration of wind power in the power grid increasing, the impact of wind power on the system stability becomes more and more apparent. Constructing a double-fed induction generator (DFIG) model that is suitable for the power system simulation is the basis for the dynamic study of wind power embedded system. Detailed DFIG model often increases the dimensions of the system and needs relatively long simulation time. Therefore, a reduced order method based on selection modal analysis (SMA) is proposed in this paper. The configuration, control system and the modal analysis of DFIGs are firstly introduced, and then the steps and methods for reducing order based on SMA are introduced. The reduced-order analysis of the DFIGs is based on the detailed model and the reduced order method. This method retains the original physical meaning of the variables and has strong flexibility and applicability. The numerical simulation results show that the reduced model can well fit the original steady-state and transient behavior of the system, which significantly reduces the computational complexity and thus improves the computational efficiency.