Keywords: GPRS (General Packet Radio Service), Online Charging System (OCS), Online Rate Abstract. Based on Online Charging System in one communication operator, the paper analyses some reasons for low online rate of General Packet Radio Service (GPRS) in this system. It is out of balance load and has low resource utilization. Some optimization schemes are proposed in this paper. It optimizes the process of the front, dispatch and inverse count module. It adds junction proxy cluster to ensure load balancing. The ratio of receive to response is optimized in the front. The zero fee Charge Detail Records (CDRs) and signaling CDRs in the GPRS are distinguished with special processing. By comparing system performance, the data shows that the optimization module performance is much better than the old one in processing ability and efficiency. It assures load balancing and takes up less host resource and storage space. Online rate is significantly improved and the remind delay is greatly be shortened. It is effective in energy saving and cost reducing on operation and maintenance.