Based on digital interference technology and second-harmonic generation (SHG) technology, a experimental method in diagnosing the phase aberration and phase coincidence on fundamental frequency and SHG laser wavefront is designed in coherent control. According to such technology, an effective auto-controlling system is designed and applied successfully in the coherent control photocurrent experiments. The method using retrieval algorithm, bases on the relationship between the beam intensity and phase difference to calculate spatial morphology in order to achieve the voltage of adjusting the piezoceramics, so that the mobile-mirror gets a movement with less aberration. The experimental results show that system can adjust the phase difference between the fundamental laser and its SHG automatically in real time, and realize the both wavefront being parallel in light aperture.