Abstract: A guidance and basis can be provided for Internet’s redesign and performance improvement by analyzing the Internet’s structural characteristics. Firstly， variation characteristics of network parameter could be got by using coarsness renormalization to process IPv4 level and IPv6 level’s topology in Internet. Secondly， fractal feature of degree’s distribution in Internet was explored. Finally， the fractal feature of IP level data in time evolution dimensionality was researched by analyzing the data from CAIDA data source. The result showed that， the network was of fractal similar feature while the value of the network’s k was low， and the connections among nodes with high degree went down as the development of time dimension. The relevant conclusions could be used to guide the subsequent research in Internet’s structural characteristics.

Key words: complex network, fractal, degree, renormalization algorithm, IPv6