The reflection characteristics of one-dimensional polybasic photonic crystals by using heterostructure were studied by transfer matrix method．The influence of the disorder of three element compound dielectric layers was mainly disscused. The results indicate that the heterostructure consists of two one-dimensional polybasic photonic crystals with suitable photonic bandgap can substantially enlarge omnidirectional reflection frequency range. When the incident angle is in the range of 0°～89°, the band of total refection can be achieved from 0.410w/w0to 0.785w/w0. Completed with the two element compound dielectric layers, three element photonic crystals can decrease the influence of the disorder produced in crystal preparation process. The results provide theoretical support for the preparation and application of wide-angle reflector invisible and infrared light band.