In this paper, we developed a floating image device with 2-views auto-stereoscopic display as the image source. The projection lens project the 3D images in the free space 50cm from the viewer and 20cm from the outer lens of the device. The special designed lens combination which provides at least 20 degrees view angle let viewer could move head at will 11cm. The device has motion parallax and binocular parallax in the meanwhile and fits to be a man-machine interface or interaction device.