Abstract: Competitive power sales market is developing rapidly and differentiated reliability services become promising while it is still restricted by free rider phenomenon and information asymmetry. Therefore, this paper establishes a two-level game model among market subjects, which aims at the distribution network reconfiguration with priority to reliability service. First, reliability services with accuracy and differentiation are defined based on the minimal path method. Secondly, the annual service contract signed by distribution system operator (DSO) and reliability service aggregator (RSA) is designed. Thirdly, the game relationship among DSO, RSA and users is built. In the upper game, DSO is the master, RSA is slave and both parties realize their respective benefits through games with the determined reconfiguration strategy and total cost. In the lower cooperative game, the reliability cost is fairly shared by users through Shapley value method. The decentralized iterate algorithm is used to solve the model stably under the premise of proving the existence of Nash equilibrium. Finally, an example is used to verify that the method can accurately ensure the reliability of priority users during blackout and satisfy differentiated reliability demands.