Each regional distribution network has an economic operation range

which makes its line loss reach the minimum value. However

the access of distributed generators(DGs)will affect the operation condition of distribution network

and may cause distribution network to deviate or enter economic operation range. In order to maintain the economic operation of distribution network

this paper proposes a line loss allocation model

which takes the influence of access of DGs on economic operation time into consideration. Firstly

based on the equivalent resistance theory

the line loss of distribution network is calculated. The concept of economic operation time of distribution network is introduced with the goal of minimum line loss

and the load ranges can be calculated respectively before and after the access of DG to the grid. According to the analysis of the difference of load ranges

different operation scenes of distribution network connected with DG are formed. On the basis of power plow tracing algorithm for sharing line loss

the coefficients of rewards and punishment are set for DG in different operation scenes of distributed network. Then the line loss shared by DG is modified. Finally

the actual operation line of a certain area is taken as an example for analysis. Compared with the result of power flow tracing algorithm

the final allocation result verifies the correctness and effectiveness of the proposed method.