1. Exchange official website: Most exchanges will publish the detailed information of the commission refund ratio on their official website. We can directly log on to the official website Stock Exchange and look for relevant proportion information on the relevant pages or the supervision documents of handling fees. 2. Exchange customer service: If we can't find the information we need in the above two ways, we can choose to contact the exchange customer service department. The customer service staff will provide relevant help and guidance, and inform us of the specific situation of the refund ratio.