Current trends of development about complex-period photonic crystal were reviewed. Multi-layer complex structure and nesting complex structure in one-,two-,and threedimension were compared. It can be concluded that the complex structure can produce more photonic bands than single structure. The multi-layer complex structure can adjust the wavelength and width of photonic band,and the nesting complex structure can control the model of band. The preparation and usage of complex structures were also introduced.