In the subaperture stitching test, mismatch between the overlapping areas always exists due to various kinds of error sources, which results in stitching edge artifacts. Although the visibility of the artifacts is dependent on many factors, it is necessary to study how to remove it. A weighting technique was proposed to suppress the stitching edge artifacts. Its performance was demonstrated by using simulation. Finally, the experimental results verify its effectiveness to suppress the stitching edge artifacts in actual measurements.