When serious HVDC transmission fault happens, emergency load shedding measures will be taken. In order to achieve the precise load shedding, it proposes a real-time load control decision technology based on user’s interruptible load. Some key technologies involved in the process of control decision are studied just like quick response, precise control, stability control security. Designed the mechanism used in the decision such as user dynamic sequence table, decision preparation, load cycle supplement, failure switch list and so on. Finally, the application scene of real-time control decision is simulated. The real-time control decision technology proposed in this paper has been applied in the large scale supply and demand friendly interactive system, and has realized real-time precision control ability to user’s interrupt after receiving the load shedding instruction.