In order to accurately assess the reliability of distribution network and improve the efficiency of power distribution terminal optimization, this paper puts forward a kind of distribution terminal optimization method based on the tub shape of failure rate function. The Weibull distribution is applied in modelling bathtub curve of component failure rate, and based on the up-stream delivering and down-stream merging of reliability indices of distribution system reliability evaluation method, the reliability of the distribution network is evaluated. Considering the bathtub curve of component failure rate and according to the typical characteristics of distribution terminal optimization, the power distribution terminal configuration is optimized with qualitative analysis. Hereafter, the method of quantitative calculation is adopted to verify the reliability of the power distribution terminal whether meets the requirements. The results show that compared with other optimization methods, such as genetic algorithm, dynamic programming and ant colony algorithm, the method requires less amount of calculation. The correctness and validity of the method are verified by an aerial wire example. This work is supported by National Natural Science Foundation of China (No. 51307071).