Risk is directly proportional to reward. The lower the fund risk, the lower the corresponding income. The higher the fund risk, the higher the corresponding income. Investors can choose appropriate funds to invest according to their risk tolerance. Investors with low risk level can choose money funds and bond funds to invest, while investors with high risk level can choose hybrid funds, stock funds, index funds and linked funds to invest. It should be noted that investors cannot purchase products with mismatched risk levels across levels.