It is one of the difficulties of power system analysis and control to determine the emergency control strategy of the AC/DC transmission systems with the generator tripping，load shedding and DC power lifting，taken into account.An emergency control method based on the sensitivity analysis of transient kinetic energy of the dynamic saddle point（DSP）is proposed.The searching direction is to be selected by the improvements of DSP transient kinetic energy with the control measures and all unitsweighted participation factor indices，so as to track the unstable mode and participation factor variations，and search for the coordinative emergency control strategy.The analysis results of the Central China-North China-East China interconnected power grid and the South China power grid show that the proposed approach is practical and effective.