Abstract: After the occurrence of N-1 faults in urban power grids, there is a high possibility of new operational risks, leading to large-scale power outages during N-1-1. To control the operational risks of urban power grids after N-1, the paper proposes an N-1 new risk control transfer strategy based on improved Dueling Double Deep Q Network (D3QN) method with double agent for urban power grids. Based on the principle of risk management and control, an N-1 scenario indicator that considers the risk of single supply substations is proposed, as well as single supply load buses and backup automatic switching device. And a three-stage solution model for load transfer that takes into account the sequence of actions and the relationship between indicators is established. The article proposes a D3QN method with double agent and pre-action changing ε selection strategy, which divides the load transfer into multiple sub transfer stages for learning, clarifies the transfer idea, reduces the dimensionality of the action space, improves the training optimization effect, and obtains a load transfer strategy that controls N-1 risks. The effectiveness of the model and method proposed in this paper has been verified through the analysis of multiple scenarios in urban power grids.