Abstract: Layer and community were first introduced into software network and investigated. Some relevant concepts were therefore defined including the level, community, chief and degree of interweavement. Community reflects the modularity and fault tolerance of software, while the level and degree of interweavement reflect the coupling. Then, some softwares were selected individually as samples. It was found that if the number of nodes in a software network is greater than 1000, the number of nodes in the communities at all levels, among which the chief node of the maximum number of communities at level-0 is selected as the chief tends to correspond with a logarithmic function with the increasing route length, while no obvious correlation is found between the degree of interweavement and number of nodes. The results are instructive to the R&D of software and provide a measure set for new software.