Inverter interfaced distributed generation connect the distribution network through power electronic devices,the difference of access points brings out multifaceted impacts on harmonic in distributed network.To minimize the harmonic current in power distribution network,this paper first makes DG equivalent in harmonic source,then builds simulation model in Simulink through power system blockset provided by Matlab on the principle of optimum point selecting,and includes harmonic distribution characteristics when DG access different point in distribution network by analogy analysis,and provide the basis for further improvement scheme to eliminate harmonic.