The Bragg reflective characteristics of light propagating in ZnS/ZnSe periodic stratified structure have been analysed and calculated on the basis of light propagating theory in multilayer media.From the curves of relation between Bragg reflectivity and wavelength

it is found that the peak values of the Bragg reflective curves will deviate from the original positions with the ZnS/ZnSe refractive index increasing or decreasing.The deviative direction is related to the index change sign. It shows that a new "optical control switch" or "optical logical devices" can be achieved and applicated in the opticalintreconnection or opticalcomputer logical devices. The corresponding experiments will be reported later.