In real communication systems, each node has a finite queue due to physical constraints. In this study, the influence of queue resource on data traffic dynamic in scale-free networks with finite queue resource was investigated. And a queue resource reallocation strategy was proposed. In this strategy, the allocation of queue length on node i is based on the betweenness centrality of node i. Simulations show that the capacity of the scale-free network can be improved by using the proposed strategy under the shortest path routing. With finite queue resource, the network traffic capacity was also analyzed theoretically.