The core of investor suitability includes the following three aspects: first, to evaluate investors, operating institutions need to have a comprehensive understanding of investors, that is, the principle of "know your customer", clarify investors' risk tolerance and classify investors; The second is to evaluate the risks of investment products, so that the operating institutions can understand the potential risks of the products and services they provide, especially the products and services, and establish a sound product or service grading system; Third, the operating agencies provide the right products and services for the right investors on the basis of fully understanding the investors and the products and services they provide.