It can be repaid in one go. The specific repayment method is:

1. Open the Bank of China app, find the "Account Check and Repayment" option, and click to enter.

2. Click "Repay" in the account checking and repayment interface.

3. Enter the amount to be repaid and click the "Confirm Repayment" option below.

4. Check the information on the repayment interface. After confirming that it is correct, click "Confirm Repayment" below.

5. Then enter the password. Once the input is completed, the one-time repayment operation can be completed.