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In the context of new power system construction and the increasingly severe risks of urban security， urban power supply security has now become a top priority of urban security. Firstly， the risks faced by urban power grid in the context of new power system are analyzed. Then， major urban power supply accidents at home and abroad in recent years are sorted out， and the causes of each accident are analyzed. Then， the concept of risk transmission chain is put forward. Based on the evolution and conduction theory of the proposed risk chain， major urban power supply accidents at home and abroad in recent years are deduced， a detailed risk blocking scheme is formulated， and the grid risk assessment process and risk blocking deduction framework are put forward. Finally， the main measures and suggestions for improving the safety level of urban power supply are put forward. The proposed risk transmission chain and risk blocking measures have practical significance for consolidating urban power supply security in building a new power system.