According to the regulatory requirements, the purchase of graded B funds requires opening business authority and meeting the following two conditions. First of all, the risk assessment is positive. Second, in the first 20 trading days, the average securities assets under the name are not less than 300,000, including assets in securities accounts and capital accounts opened in the name of investors.

Graded fund, also known as structured fund, refers to a fund variety that obtains two-level (or multi-level) risk-return performance with a certain differentiated fund share by decomposing the fund income or net assets under a portfolio. The grading modes of stock (index) grading funds mainly include financing grading mode and long-short grading mode. Bond-type graded funds are classified as financing. Currency grading funds are divided into long positions and short positions.

According to the investment nature of graded parent funds, parent funds can be divided into graded stock funds (mostly graded index funds) and graded bond funds. Graded bond funds can be divided into pure bond grading funds, mixed bond grading funds and convertible bond grading funds. The difference is that pure bond funds can't invest in stocks, mixed bond funds can invest in stocks with no more than 20% assets, and convertible bond grading funds can invest in convertible bonds. According to the nature of graded sub-funds, class A shares in sub-funds can be divided into class A agreed income share funds with a time limit and class A agreed income share funds with a perpetual period. Class B shares in sub-funds are also called leveraged funds. Leveraged funds can be divided into stock-type B leveraged share funds (mostly leveraged index funds), bond-type B leveraged share funds (leveraged debt base) and reverse leveraged funds.