This study examined the supersensitization of 4-hydroxy-6-methyl-1,3,3a,7-tetrazaindene (TAI) in silver chloride emulsions. A systematic investigation on the concentration of TAI and the order of adding TAI and dyes had been carried out. It was discovered that the supersensitization efficiency of TAI varied greatly with the order of adding TAI and the concentration of TAI. The spectrometry study suggested that TAI could intensify the formation of the J-aggregate of dye and had quite different effects on the absorption spectra and spectral distribution of emulsion sensitivity when added in different orders.