Bond rating classification
AAA level: it will not be affected by the market economy environment, has very strong solvency, and basically has no default risk;
AA level: little impact on the market economy environment, strong solvency and low risk;
Grade A: If it encounters a depressed economic environment, it will be easily affected, with strong solvency and low default risk;
BBB grade: it will be greatly affected when the economic environment is depressed, with relatively average solvency and average risk-taking ability;
Grade BB: it is greatly affected by the adverse economic environment and the risk is relatively high;
Grade B: The ability to repay debts depends on a good economic environment and bears high risks;
CCC level: the solvency is very dependent on the big economic environment, and the risk of default is extremely high;
CC level: when declared bankrupt or reorganized, there is little guarantee and basically no ability to repay debts;
Grade C: basically unable to repay debts.