According to the China Securities Regulatory Commission's Compilation Rules for Information Disclosure of Securities Investment Funds No.5 and the Special Provisions on Information Disclosure of Money Market Funds, money market funds shall disclose the seven-day annualized rate of return per 10,000 fund net income on the open day at least on the next day of each open day in designated newspapers and managers' websites. The net income per 10,000 fund shares here refers to the net income of the fund obtained on a certain day or during a certain period for every 654.38+0,000 fund shares. The calculation method is to multiply the daily net income of the fund by 10000, and the specific formula is: daily net income per 10,000 funds = (net income of the fund on that day/total fund share on that day) ×10000; Net income per 10,000 funds during the period = sum of net income per 10,000 funds during the period; The single-day net income of 10,000 funds largely depends on the date of interest set of securities or deposits held by the fund, which does not have the significance of reflecting the profitability of the fund. Therefore, it is popular in the field of international investment management to adjust the net income of the fund in the past seven days on an annual basis to reflect the current rate of return of the portfolio, which is convenient for investors to compare horizontally. Under different income carry-over methods, the calculation formula of seven-day annualized rate of return should also be different. According to the above regulations of China Securities Regulatory Commission, the calculation method of 7-day annualized rate of return of China money market funds depends on the fund's income carry-over method. At present, there are two ways to carry forward money market funds. One is "daily dividend, carried forward on a monthly basis", which is equivalent to daily simple interest and monthly compound interest. The other is "daily dividend, daily carry-over", which is equivalent to daily compound interest. The simple interest calculation formula is: (∑Ri/7)×365/ 10000 ×100%; The compound interest formula is: (∑Ri/ 10000 copies) 365/7× 100%. Where Ri is the earnings per 10,000 shares in the last I calendar days (I = 1, 2).