In this paper

the new features on power quality of smart distribution grid is introduced

including the features of non-linearization of grid

frequent reconfiguration of topological structure

capacitive of equivalent impedance and sufficient integration micro grid. On this basis

the harmonics is taken as main analysis object in this paper

the problems faced including the high frequency harmoncs and the interactions between grid and harmonic sources are discussed high frequency and the interaction of grid source are described. Finally

the auxiliary decision based on data application of power quality is proposed

which is a kind of research work needed urgent development in the construction of smart distribution grid.