A quota management method includes: sending, by a client, a charging request to a server, where the charging request carries quota request information and information of quota usage; receiving, by the client, a granted quota and indication information from the server; processing, by the client, the granted quota and a remaining quota on the client based on the indication information, where the remaining quota is a difference between a quota granted by the server last time and the quota usage in the charging request; and using, by the client, a processed quota, and reporting information of usage of the processed quota when a reporting condition is met.