Abstract: In this paper,the principle of photovoltaic（PV） power generation is introduced briefly,the advantage and development trend of PV are also discussed,and the development status and the prospects of photovoltaic generation and grid-connected technology at home and abroad are mainly demonstrated.Due to the randomness and discontinuity of the output of photovoltaic generation,maximum power point tracking（MPPT） has always been the hot topic.With the development of photovoltaic technology,to meet new requirements,some improved MPPT methods have been presented,which can not only enhance the system stability,but also be applied to numerous operating conditions.The grid-connected photovoltaic plant will have impact on the power grid,such as the islanding effect,the problem of harmonic pollution,reactive power compensation and voltage flicker.With the capacity increasing of photovoltaic plants,the above influences need to be solved urgently,so some current countermeasures are concluded.The inverter is the key technology of grid-connected PV system.In this paper,the functions and requirements of the grid-connected inverter are described,and the evolution of its topology,some issues and development trend of large-scale grid-connected PV plant are also discussed.