With the large scale of distributed photovoltaic accessing

the state of power flow

voltage and network loss of distributed grid has been changed obviously.Research on the calculation method of network loss with distributed photovoltaic has been introduced in this paper.By simulation with village network

the influence has been illustrated on the condition of different capacity

position and access mode.The conclusions are given as network loss are reducing with capacity growth for a while

but increasing in the end.Secondly

it should be accessed in the middle of line if the capacity of distributed photovoltaic is large.Thirdly

it is suggested tochose decentralized accessing mode.And the resolutions of reducing network loss are proposed as increasing local consumption

adding automatic voltage control device

developing grid reconfiguration function and so on.