Shandong Univ, Minist Educ, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China
; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
Small angle X-ray scattering (SAXS) has already become a powerful research tool in the interdisciplinary frontier so called "soft condensed matter". The characteristics of SAXS and its wide applications in colloid dispersive systems and organized molecular assemblies are reviewed in this paper. Focuses are laid on studying the size distribution of particle or the aperture, the dispersal states of the colloid systems, long range order structures and the interaction of complex systems.