The embodiment of the invention discloses a call charging method and a system thereof, which pertain to the communication field. The method comprises: reusing information about resources of held calls reused by new calls is received and the new calls are charged according to the reusing information. The system comprises network element equipment and charging equipment. The embodiment of the invention also discloses an information submission device, charging equipment, on-line charging equipment and off-line charging equipment and charges new calls according to the reusing information about resources of held calls reused by the new calls, thus more accurately charging according to the resource reusing situation and improving the utilization rate of network resource and the experience of users.