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In current peer-to-peer systems, system performance is evaluated by the metrics that characterize the features of the whole system while how each node's character affects the system performance is rarely considered. In this paper, we first introduce a new metric of publishing efficiency to quantitatively measure the impact of node's character on the system performance, and also we demonstrate the significance of the proposed metric. Then we build an analytical model to study how nodes' online time, shared resources and the ranges that the indices and resources of the nodes serve queries affect their publishing efficiency. We validate the analytical results through simulation and discuss their significance to improving the average nodes' publishing efficiency in peer-to-peer systems.