Increasing penetration of wind farms will make an impact on the stability of power system transient process. It has resulted in the need for the wind tripping measures in the power system emergency control. Firstly, the doubly-fed induction generator (DFIG) transient operating characteristics are analyzed. Secondly, the different tripping effects between DFIG and conventional synchronous generator are analyzed by using advanced branch transient energy function. The results show that the combination of the wind power and thermal power tripping should be considered in the emergency control of the grid-connected wind farms system. Therefore, an optimal tripping decision-making model considering wind turbine and a practical method are proposed to select the optimal ratio of the thermal to wind tripping reasonably, improve the characteristics of the system recovery process, and enhance the stability of the power system. A transient tripping example of a certain regional system shows that the practical method is feasible and efficient.