The application of holographic technology to display true 3 D images is a bright spot in the display field.In order to investigate the interaction between people and 3 D holographic images,a vision-based interaction method between finger and holographic images is proposed.Combining background difference with color difference method,detect hand area,and then locate fingertip by analyzing hand contour curvature,guide the display of 3D head holographic real images via tracking fingertip,then,the dynamic interaction between people and holographic images can be realized.Finally,validate the veracity of fingertip locating by comparing fingertip positions detected by program and by manual work,and validate the correctness of interaction by analyzing the corresponding relationship between fingertip positions and head images.