Associating with the self-designed distributed database server system and studying the objective description and definition of load index, this paper proposes a three-level management framework of distributed redundant service system, introduces an active load-balancing idea into the system, and then presents the load-balancing model based on mobile agent. The performance of the system is finally analyzed. Compared with traditional distributed computing models, we conclude the novel model has lower cost, higher reliability, higher expandability, higher throughput, and higher efficiency. [ABSTRACT FROM AUTHOR]