The access of distributed generation to distribution network will lead to the change of power flow, power transmission loss and load rate of the distribution network, which makes the network loss allocation more complicated. Based on the principle of traditional line loss allocation, a comprehensive overview of the existing methods of line loss distribution is presented based on proportion sharing, market economy and sensitivity coefficient analysis,and the possible problems of each method after considering the distributed power supply are put forward. Furthermore, the new trend of loss allocation of distribntion network with DG is prospected in the aspects of improving the traditional method of network loss allocation, exploring new methods of network loss allocation, considering the operation efficiency of distribution network, considering the influence of distributed power to distribution network, etc.