Although SWFs was established earlier, it has not attracted the attention of the world because of its small scale. It is estimated that the global sovereign wealth fund of 1990 was only about $500 million. In recent 10 ~ 15 years, SWFs has achieved amazing growth in recent years, with the total amount reaching 20,000 ~ 3 trillion US dollars, thanks to the rising oil price and the large surplus of international payments of emerging market economies. The total size of the world's five largest sovereign wealth funds exceeds US$ 2 trillion (about US$ 875 billion from Abu Dhabi Investment Authority of the United Arab Emirates, US$ 354.9 billion from NBIM of the Norwegian central bank, US$ 330 billion from Singapore government investment companies, US$ 300 billion from Saudi Arabia sovereign wealth funds and US$ 250 billion from Kuwait Investment Authority, as shown in the following table). Judging from the percentage of assets managed by the fund relative to the GDP of the countries where the fund is located, the ratio of sovereign wealth funds in the United Arab Emirates, Norway, Singapore, Kuwait, Qatar and Brunei all exceeds 100%, while that in Russia is less than 15% and that in China is less than 10%. It is worth pointing out that the capital concentration of global sovereign wealth funds is quite high, and the size of the top five funds is equivalent to more than 70% of the global total.