A general method of fault current calculation with reduced computation is proposed for distribution network with Distribution Generation (DG), with regard to the issue of poor generality or intensive computation in fault current calculation. The DGs are divided into two types, which are generator-connected and inverter-connected. Considering the low voltage traversal requirements, the fault characteristics of the DGs are calculated. On this basis, according to the superposition theorem, the linear fault distribution network is divided into two parts under different excitation sources. The fault currents of the distribution networks under two kinds of excitation sources are calculated respectively, and the total fault current is obtained by superposition. During the calculation process, the fault current component generated by inverter-connected excitation source is solved by iterative algorithm. The method is programmed and the actual example is solved. The calculation results show that the method is correct and effective. This work is Natural Science Basic Program of Shaanxi Province (No. 2015JM5211).