According to the accounting school network, the provisions on the credit rating of publicly issued corporate bonds refer to the definition of bond credit rating standards that investors can rely on when purchasing bonds. Bond credit rating refers to the credit rating given by specific institutions (such as Standard & Poor's, Fitch and Morgan Stanley) according to objective standards. Bonds with low credit ratings get lower ratings, while bonds with high credit ratings can get higher ratings. Therefore, the credit rating standards of bond fund companies are open.