The invention discloses a charging method based on the service quality strategy and a resource admission control subsystem. Wherein, the method includes adding a charging decision-making functional entity on a strategy decision-making functional entity based on the service, wherein, the charging decision-making functional entity is utilized to generate a charging strategy; the strategy decision-making functional entity based on the service receives a strategy request from an application functional entity, the charging decision-making functional entity generates the charging strategy accordingto the service description information contained in the strategy request; the strategy decision-making functional entity based on the service transmits the strategy request carrying the charging strategy to an access resource admission control functional entity and a boundary gateway functional entity that participates in the charging process. The invention enables the resource admission control subsystem to support the charging function based on the QoS strategy.