Abstract: Te-Se-I glass and adding As,Ge elements to it are studied with Self Consistent Field Diserete Variational X_α (SCF-DV X_α),one of the molecule orbital calculating methods in quantum chemistry.The chemical bonding is studied to discuss the relations between structures and properties with the variations of compositions of the glasses.The calculated results show that the strength of covalent and ionic bonds are both in the order of Ge-Se > As-Se > Te-Se, which is consistent with the experimental result of glass transition temperature(Tg) of the corresponding glasses.The Te-I bond in which I atom is one coordinate is stronger than that in which I atom is two-coordinate,As-I and As As bonds are both stronger than the two types of Te-I bonds.The weak Te-I bonds have been replaced by the stronger As-I and As-As bonds,which is just the reason why with the increace of As element,the structures and properties of Te₂Se_7-x-IAs_x glasses can be changed.