In the high voltage ride through problem of doubly fed induction generator (DFIG), the study of transient characteristics of stator flux is the basis and basis for realizing high voltage ride through operation, While the conventional studies only for single mode analysis of grid voltage swell, and ignored the fault dynamic change of stator flux recovery after the fault recovery, so that the transient characteristic analysis is not comprehensive. In this paper, the whole process of stator flux transient in different surge modes of grid voltage is studied. On this basis, the factors influencing the transient characteristics of stator flux are compared and analyzed. Grid voltage surge mode is different, the stator flux transient characteristics are also different, and the transient attenuation component of mode II is much smaller than mode I; When the voltage rise of the adjacent grid is the same and the time interval is , the transient attenuation component of the stator flux can be minimized. The simulation results verify the correctness of the theoretical analysis, The research of this paper has certain reference value to master the dynamic process of DFIG and the formulation of high voltage ride through control strategy.