For harmonic source characteristics and power volatility of distributed PV, the effects of PV connecting to grid on harmonics, voltage fluctuation and flicker of distribution network are analyzed. And the impact of background power quality of distribution network on the power quality of PV connecting points is also analyzed. Meanwhile, a typical distribution network is built on DIgSILENT / PowerFactory simulation platform, which is considered to be suitable for study of PV grid-connecting characteristics by CIGRE. According to IEC 61400-4-15 standard, the IEC voltage flicker meter is also built on the platform. And then the harmonic transmission and amplification characteristics, the impact and assessment of voltage fluctuation and flicker are simulated. The simulation results show that harmonic transmission and amplification characteristics are complex in distribution network with multiple distributed PV. Additionally, the value of voltage fluctuation and flicker at each bus node is closely related to the short-circuit capacity of the bus node and power fluctuation of distributed PV.