By the end of 2020，there are 442 units in operation worldwide，with a total installed capacity exceeding 392454 MWe.There are 53 nuclear power units under construction worldwide，total installed capacity exceeds 56393 MWe. Compared with 2019，the number of units in operation and under construction in the world decreased by one. Major nuclear power countries in the world continue to invest in the research and development of the third generation nuclear power technology，small modular reactors，advanced nuclear power reactors，fusion reactors，etc. In the research and development of advanced reactors，pressurized water reactors and fast reactors are the mainstream directions of nuclear energy technology development. The world’s nuclear fuel cycle industry has sufficient supply support capacity. Due to the overall oversupply of natural uranium market，the price of natural uranium has been running at a low level in recent years. According to the forecast data of authoritative organizations in the world in 2020，the installed capacity of nuclear power in the world will increase significantly in the future，and by 2050，the installed capacity of nuclear power in the world will more than double that before.