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There has happened several severe blackout contingencies all over the world in recent ten years, and scholars have widely studied the cascading failure and blackout applying the self-organized criticality theory. However, little of the cascading failure models have considered the DC transmission and the complete dynamics, and different AC/DC interconnection modes and capacity distributions have significant impact on the system self-organized criticality. A dynamic cascading failure model including emergency control and protection probability characteristics and DC dynamics is proposed, with which dynamic simulation is performed to the 2010 East China power grid. In conditions of different AC/DC interconnection modes and capacity distributions, the outage power-outage probability curve is calculated, the impact on system self-organized criticality is analyzed, and the conclution that the probability of cascading failure and blackout can be decreased by selecting the suitable AC/DC interconnection mode and capacity distribution is obtained.