Abstract: High voltage ride-through (HVRT) control strategy may cause stability problems of a doubly-fed induction generator (DFIG) integrated system when over-voltage occurs due to system faults. To tackle this problem, firstly the current feasible region of DFIG during HVRT process was analyzed. Based on the U_t-I_d characteristics of DFIG integrated system, the transient voltage instability mechanism caused by the absence of the equilibrium point was revealed. The influence of key factors such as over-voltage level, grid strength, and reactive current gain coefficient was analyzed. Then, the system small signal model during HVRT was derived, and the effects of reactive current control dynamics on small disturbance stability were studied. Based on the stability analysis, two key parameters of the reactive current gain and the distribution coefficients were designed. Finally, the simulation of the typical system of DFIG integrating to infinite grid through the line based on MATLAB/Simulink verifies the rationality of the theoretical analysis.