Complex systems and complexity science to be home and abroad are believed as the 21st century scientific development frontier by numerous scientists. At present, the complex network and software engineering crossover study has just started. The research results of complex systems and complex networks provide a powerful support for exploring the structure characteristics and behavior characteristics of software systems. This paper tests scale free characteristics on NASA data empirically. More specially, this paper checks whether two of Chidamber and Kemerer metrics suite, namely, CBO and WMC follow power law or not.