Previously, the People's Bank of China released the national foreign exchange reserve data at the end of 2009, and the foreign exchange reserve increased by 453,654,380+billion US dollars last year. In the same period, the trade surplus was US$ 6,543.8+US$ 096.07 billion, and the actually utilized foreign capital was US$ 90.03 billion. The difference between these two items and the increase in foreign exchange reserves is $654.38+067 billion. Some analysts believe that this difference cannot be explained, that is, the inflow of "hot money".