Abstract: There is mounting experimental evidence that network traffic processes exhibit ubiquitous properties of self-similarity and long-range dependence （LRD）, and self-similarity and long-range dependence have great impact on network performances. However, most

Key words: Netword traffic,Self-similarity, Fractional brownian motion, Superposition of fractal renew process （Sup_FRP）, Index of dispersion for counts （IDC）