Credit risk refers to the possibility that the counterparty is unwilling or lose the ability to fulfill the obligations related to the contract to cause losses to commercial banks for various reasons. In credit activities, if the borrower fails to repay the principal and interest of the loan on time, and the guarantor fails to fulfill the guarantee obligation, there will be credit risk. But this is not exactly the same as default, it will only reduce the credit rating of the enterprise, which means that it greatly increases the possibility of customer default. Credit risk is the root of credit risk.