A new reliability evaluation method of complex distribution system is proposed based on distribution system delaminating subareas and Breadth First Search.The distribution system is divided into different layers and subarea according to voltage level and defined the area node in each voltage level.The reliability evaluation is carried out using Breadth First Search method.The simulation results of RBTS bus 6 proved the validity.In the new evaluation process

the zone node definition makes the subarea partition more direct and more efficient

its analysis object becomes the branch which also makes the process simple

and the adaptability of the method to different distribution system is improved.Comparing the evaluation results of the new method with the traditional methods

it is proved that the new method is more rapid and has a better robustness in the variety of network configuration.