Abstract: In the paper the Π electron molecular orbital energy level and electron spectra of some unsymme-trical bisazo derivatives of chromotropic acid containing halogen group are studied with HMOmethod. The results of calculation show that the maximum peak value is about smaller 8 nm than the experimental value. The substituting position of electrophilic group accord with experimental value. According to these results the red shift of electron spectra and the substituting position of electrophilic group are discussed.