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In order to solve the problem of service reliability caused by link disconnection and network partitioning in mobile cloud computing system, a service software architecture based on service copy management and node self-adaptive configuration is proposed. It consists of communication middleware, monitoring system, context manager and copy manager. The replica manager activates or sleeps the node through an adaptive configuration algorithm based on the monitored service demand and node information, so that the task can be executed in the most suitable node currently, thereby improving the reliability of the computing service system. The case study shows that the scheme can guarantee the service reliability in the dynamic network environment.