The embodiment of the invention discloses a charging method and a charging system which relates to the communication field. The charging method on-line provided by the embodiment includes: the charging system receives charging requirement of operation first network element, distributes charging context sign of operation for operation, and returns charging context sign of operation to first network element; the charging system receives charging request of operation second network element, wherein, the charging requirement carries charging context sign of operation transferred from first network element to second network element, the charging system obtains each charging conversation of charging context sign with same operation according with charging context sign of operation, and obtains result associated with charging by processing operation charging information association to each charging conversation; the charging system can control charging to operation according with result associated with charging. The technical scheme provided by the invention can realize charging association, and can realize charging on-line control to operation.