Four styles of fractal informations are constructed on the Cantor sets as time axis. Based upon a view point of generative
production, we have found the recurrence formulae of spectral structure factor and of spectral shape factors of them, plotted a
series of curves of the structure factor and four series of curves of the spectral functions. From the comparison and progression
of these curves, it can be seen that the structure factor plays a ground role, and the shape factor plays a modulatory role, there
are a competitive phenomena between generations in frequency domain. This investigation provides a basis for further
understanding of the features of fractal informations by a new representation such as frequency domain.