In order to solve the problem of low accuracy rate caused by the equal length segmentation of the attention curve in the traditional methods, a scheme is proposed, in which the key video segments are extracted based on the image quality curve. The frame with the highest attention value is selected from each segment as the key frame. On the local database, the precision and F-measure are 52.94% and 62.77%, 5.23% and 2.65% higher than those by the Muhammad method, respectively.