A tiling-display system includes an image source device, a splitter unit, a plurality of control units, and a plurality of display devices. The splitter unit receives a source image from the image source device and outputs a plurality of replication images. Each of the source image and the replication images has a first image size. The control units receive the replication images and generate sub-images according to groups of setting parameters. Each of the groups of setting parameter includes a scale, a shift and a rotation angle. The shifts of the group of the setting parameters are different from each other, and each of the plurality of sub-images has a second image size and the corresponding rotation angle. The display devices receive and display the sub-images from the control units. The display devices are arranged according to the rotation angle and display a tiled image.