A fund custodian is a party who undertakes the related responsibilities such as asset custody, transaction supervision, information disclosure, fund settlement and accounting in the operation of securities investment funds according to the requirements of laws and regulations. The fund custodian has four responsibilities: 1. Asset custody, that is, the fund custodian should set up an independent account for the fund assets to ensure the safety and integrity of all the assets of the fund. 2. Fund settlement, that is, executing the investment instructions of the fund manager and handling fund transactions in the name of the fund. 3. Asset accounting, that is, establishing fund account books and accounting, checking and rechecking the net asset value and net fund share value calculated by the manager. 4. Investment operation supervision, that is, to supervise whether the behavior of fund managers conforms to laws and regulations and the provisions of fund contracts. Fund custodians mainly obtain custody fees through custody business as the main source of income, and the custody scale is directly proportional to the receiver of custody fees.