Duration is mainly used to measure the sensitivity of bond price changes to interest rate changes. Simply put, it is two sentences: the shorter the duration, the smaller the fluctuation of bond prices and the smaller the risk; The longer the duration, the greater the fluctuation of bond prices and the greater the risk.
Ordinary bond funds, also known as medium-and long-term pure bond funds, have no restrictions on the duration of investment bonds, and can choose short-term bonds or long-term bonds. The portfolio duration of short-term and medium-term debt funds is generally less than three years.