A Mobile agent is a software program with so high mobility that it is difficult to transmit and receive messages accurately. At present, the location management of mobile agent consists of tracking phase and message delivery phase, both of which dutifully create or incur plenty of update messages and interaction messages separately in order to guarantee the effectiveness of mobile agent location management scheme. However, the transmission of messages not only affects the overall performance of mobile agent location management scheme, but also causes the network overhead. Therefore, this paper proposes a ratio-based update scheme that can minimize the overall transmission cost of produced messages. A number of simulation experiments are conducted to evaluate the proposed scheme. And, as a consequence, the simulation results reveal that this scheme is general, adaptable, and possessed of higher granularity in the network latency; moreover, the results also indicate that this scheme is better than previous schemes in optimizing the caused overall performance overhead.