The rapid and accurate reliability assessment technique is critical to the improvement of distribution network operational level. A reliability evaluation method of distribution network based on load classification is proposed in the paper, which uses probabilities and sampling approach to determine the operating state of the system and the place where the fault or failure occurs. The distribution system is divided into different types of loads for analysis, and the functions of network reconfiguration and load transfer are taken into account under the case of distributed generation. This method can effectively simplify the traditional reliability evaluation process and improve the efficiency of analysis. It can be also suitable for the real-time reliability evaluation of the distribution network. The validity of the proposed method is verified by the improved IEEE-RBTS Bus 6 system as an example.