The invention discloses a group charging ID (GCID) allocating and issuing method and a GCID processing entity. The GCID allocating and issuing method includes the steps that after the GCID processing entity receives a request message, whether an allocated GCID corresponding to a current MTC group communication service exists or not is inquired according to information, related to the current MTC group communication service, in the request message; when the GCID corresponding to the current MTC group communication service is not found, a new GCID is allocated to the current MTC group communication service, and the new GCID is forwarded to other network elements involved in the current MTC group communication service. By the GCID allocating and issuing method and the GCID processing entity, GCIDs can be allocated and issued effectively, and it can be ensured that the allocated unique GCID can be associated with group CDRs generated by different network elements involved in the same charging event.