On basis of analyzing those traditional photoelectric detection methods for interference fringe

a new photoelectric detection method satisfying counter and subdivision is present

and its main characteristic is that the difference photoelectric cells are adjacent.This method and two traditional methods are analyzed by integral equations.Applying the founded models including intensity random noise

AC amplitude and DC adrift ones

and in comparison with two traditional detection methods by theoretical and experimental analysis

the SNR of this detection method is improved to 3～6 times of that traditional methods.This method can dramatically restrain DC adrift of light intensity even if the fringes’ signal is faint.It provides a theoretical basis for realizing spot measurement of single frequency that requires high resistance to noise.