Abstract: Wind power and photovoltaic power generation are vulnerable to extreme weather,and a large number of wind turbines and photovoltaic generation units may shut down due to extreme weather,which will even threaten the safe and stable operation of power grid.The impact of extreme weather events on new energy generation and grid operation is studied. The mechanism of extreme weather affecting new energy from the perspective of new energy power generation is expounded. Based on the operation data of massive wind turbines and photovoltaic power generation units,the new energy power generation and power grid operation under several types of extreme weather conditions such as cold wave,high wind,snowfall,sand and dust are deeply analyzed. Finally,the suggestions on power grid dispatching and operation are put forward to ensure the safe and stable operation of the power grid under extreme weather conditions.