The relationship between scanning angle and scanning control voltage of fiber interferometric optical phased array was analyzed theoretically. An experimental method of the relationship between scanning angle and voltage was proposed, which was that the scanning angle corresponding to a certain scanning control voltage was measured indirectly according to the light intensity at a fixed point in the field. In the simulation experiment, the M-Z interferometric optical path was used to simulate the two-path optical fiber interferometric phased array. By changing the control voltage of the phase modulator, the intensity of the light received at the fixed point of the field was tested, and the actual scanning angle of the optical fiber interferometric phased array was calculated. The experimental results show that when the scanning control voltage is in the half-wave voltage range of phase modulation, and the scanning control voltage is much lower than that of integrated waveguide arrays, the scanning angle is 0-6.2 mrad. In this range, the experimental value of the scanning angle is in good agreement with the theoretical value of the scanning angle. The simulation experiment can provide a reference for further study of far-field scanning characteristics of optical fiber interferometric phased array.