An improved image magnification adaptive algorithm was proposed on the basis of seam carving algorithm which may appears the situation that the first k small pixels share the same points. It finds the newly adding position of pixels by some strategies through judging the sharing situation and its sharing rate, which makes the addition of new pixels in non-important area of visual attention more reasonable. The manual intervention to select the important area of visual attention is implemented to avoid perpetual object becoming warped and deformed by wrong judgment itself. Experiments show that the improved algorithms get better effects.