Credit investigation is a Chinese vocabulary, and its pinyin is zhēngxìn, which means to collect, sort out, save and process the credit information of natural persons, legal persons and other organizations according to law, provide credit reports, credit evaluation, credit information consultation and other services, help customers judge and control credit risks, and carry out credit management activities. From Zuo Gong's Eight Years, "A gentleman keeps his word and has a levy, so his resentment is far greater than his body". Among them, "collecting by faith" means that you can verify the credibility of your words, or you can collect and verify credit.