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The influence of an academic paper should be assessed under the context of citation network, in which a literatures references reveal the source of knowledge and its inheritance relationship and a literatures citing papers reflect the flow and diffusion of knowledge.ID index and its derived RID index are designed on the basis of such inheritance and diffusion to evaluate the influence of an academic paper, which not only takes into account direct references and direct citing papers but also the contribution of indirect references and indirect citing papers.With the academic papers of Library and Information Science in Web of Science as a sample, the present research selects 12 sample vertexes in main path of its citation network to calculate their ID and RID.The correlation coefficient between the ID and traversal value verifies that the ID index has higher validity and effectiveness to measure the influence of an academic paper, and tells that α=2 and β=2 are the optimistic adjusting factors.