Abstract: In order to segment the aerial image with large noise and low resolution，a new image segmentation algorithm is proposed，which introduces the characteristic of multiple scales in wavelet to the image segmentation with wide scale and can control the over-segmentation in the Mean Shift image segmentation algorithm efficiently.Moreover，the effect of image segmentation under different kernel wide window is analyzed and a performance evaluation method called segmentation error is promoted.At last，several real aerial images are segmented by new algorithm and evaluated by new method.The result shows the superiority of new algorithm and performance evaluation method.