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A method of reliability evaluation for complex medium-voltage distribution system based on simplified network model and network-equivalent is proposed in this paper. According to the topology of distribution system and the function of the protection device and the switch, a distribution network is divided into different zones, the distribution network based on electrical components is changed into a simplified network based on zones. This simplified network is laminated, based on network-reliability equivalent, thus a simple radial network is equivalent to original simplified network by use of the consequence analysis of fault pattern of the reliability index of the complex distribution system can be calculated. To implement the proposed method, a distribution network is regarded as a directed graph and the topology of the network is realized by adjacent matrix of the graph, through the search and modification of adjacent matrix can realized the partition of the distribution network and network-equivalent, so the topology of the network can be immediately modified while the reliability index can be calculated. The application of the proposed algorithm to RBTS-Bus6 shows its effectiveness.