In order to analyze the variation of the reflected light field and the reflected light intensity of the retro reflected modulator,the array retro reflected modulator is illuminated by a 532 nm laser.The reflected light field and reflected light intensity value are obtained when the amount of defocus and the incident angle are changed.The reflected light intensity relationship between the array modulator and a single modulator is obtained.The test results show that the positive defocus in a certain range makes the divergence angle of the reflected beam smaller,the energy of the reflected light is better,and the negative defocus is opposite.The incident angle is the distortion of the reflected light field,and the reflected light intensity is inversely proportional to the incident angle.When no defocusing or negative defocusing,the reflected light intensity of the array modulator is a linear superposition of the reflected light intensity of single modulator.