In this letter three photonic logic gate models are presented based on the bacteriorhodopsin(BR) polymer made from variant D96N. With the illumination of 633nm laser the BR molecules can be excited to the M state and show a strong absorption at 412nm, so the intensity of transmitted purple light will decrease until zer o when the exciting light is strong enough. A CCD camera is used to detect t he distribution of transmitted purple light intensity that can be modulated by i llumination of 633nm laser on BR film and NOT, ORNOT, ANDNOT gates are simulated under the special intensity of purple light.