The existence of phase errors severely decreases the imaging quality of optical synthetic aperture system. The quantified scales are designed for the various characteristics of piston error and tip/tilt error. Moreover, Wiener filter and correlation coefficient are opted as restoration and assessment method. Statistic results demonstrate the value of correlation coefficient can be guaranteed beyond 0.98 on condition that average piston error is less than 0.06λ and average tip/tilt error is less than 16 μrad. Furthermore, the method of rotating the array and acquiring multiple images with various spectra is utilized to reduce or eliminate the effects of phase errors. An optimized scheme is brought out by comparing the restoration results of various rotation angles and times. The experimental result shows that the proposed method can dramatically increase the restoration quality of imaging system with phase errors. The phase error tolerances can be improved to 0.12λ and 35 μrad, respectively, which means the precision demand of optical design and phase error correction is decreased.