In mobile ad hoc networks, the links among nodes are unstable due to the characteristics of node movement and limited energy, which leads to the poor rate of successful data access and the imbalance in the energy consumption among nodes. The paper discusses the stable neighbors of a node, the access frequency of a node's weight, and the node's surplus energy used in allocating the replicas. Simulation experimental results show that the algorithm improves the rate of successful data access and balances the power consumption among nodes.