The management and engineering of optical fiber is a necessary factor to be considered in the design of photoelectronic device. As a new kind of light transmission media, photonic crystal fiber (PCF) has an enormous application potential in many fields on account of its large configuration design freedom which makes its performance in the management and engineering of dispersion much more better than that of the conventional communication fibers. Firstly the management of dispersion by changing the geometric structure of PCF and the achievement of flattened dispersion is discussed. After that，the configuration designs of these years to realize flattened dispersion in PCF are emphatically presented, and the applications of its flattened dispersion is also summarized.