The adsorption and spectral sensitization of different types of dyes (cationic, anionic cyanine andmerocyanine) on silver chlorobromide were investigated by clectrochemical method, FT-IR and modelPhotographic emulsion. It has been found that addition of chloride ions can enhance the adsorption ofdyes and improve the ability of spectral sensitization. Different behaviors in adsorption and spectralsensitization appeared in different types of dyes depending on the structures and electric charges ofdyes. Merocyanine dye has the best adsorption and remarkable spectral sensitization ability on silverchlorobromide in comparison with other cyanine dyes. Experimental results also showed that there wasa good correlativity between adsorption behavior of dyes obtained by electrochemical method and spec-tral sensitization in model photographic emulsion, and the adsorption complex composed of dye andsilver halide was electro-inert but photo-active. The mechanism of spectral sensitization with variousdyes has been dis The adsorption and spectral sensitization of different types of dyes (cationic, anionic cyanine andmerocyanine) on silver chlorobromide were investigated by clectrochemical method, FT-IR and modelPhotographic emulsion. It has been found that addition of chloride ions can enhance the adsorption ofdyes and improve the Different behaviors in adsorption and spectralsensitization appeared in different types of dyes depending on the structures and electric charges of dyes. Merocyanine dye has the best adsorption and remarkable spectral sensitization ability on silverchlorobromide in comparison with other cyanine dyes. that there was a good correlativity between adsorption behavior of dyes obtained by electrochemical method and spec-tral sensitization in model photographic emulsion, and the adsorption complex composed of dye and silver halide was electro-inert but photo-active. The mechanism of spectral sensitization with variou sdyes has been dis