The adsorption of dye on AgBr is investigated with a model of AgBr electrodeposited onAg electrode by using chronopotentiometric method and electronmicroscope. It has beenfound that there is an electroinertial complex formed after adsorption of cyanine dyes,the amount of which is to some extent correlated with its sensitizing ability. The stabi-lity of this kind of complex is quantitatively characterized by a conditional dissociation con-stant K’, and the values of K’ for several cyanine dyes have been calculated. The adsorption of dye on AgBr is investigated with a model of AgBr electrodeposited onAg electrode by using chronopotentiometric method and electronmicroscope. It has been found that there is an electroinertial complex formed after adsorption of cyanine dyes, the amount of which is to some extent correlated with its The stabi-lity of this kind of complex is quantitatively characterized by a conditional dissociation con-stant K ’, and the values ​​of K’ for several cyanine dyes have been calculated.