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Traditional power flow algorithms are not applicable to the distribution network with distributed generation because of the unbalance of power source, load and line. Based on the analysis of wind turbines, photovoltaic system, fuel cell, storage battery, high frequency micro turbines and power frequency CHP(combined heat and power), their models in power flow are presented. In view of three phase unbalance and weakly meshed characteristics of the distribution network, the back/forward sweep power flow is improved, which is widely used for the radical distribution network. A new three phase back/forward sweep power flow for the weakly meshed distribution network with the distributed generation is presented. The example has proved the efficiency and feasibility of the algorithm.