Abstract: A scrolling device with color separation and a projection system incorporating same are disclosed. The scrolling device comprises a scrolling shaft and a plurality of dichroic mirrors that are spirally arranged as screw threads on the scrolling shaft. The scrolling device rotates around predetermined axis, and the dichroic-mirror threads can separate an incident light beams into two or more color light beams, thereby scrolling the positions of these color beams. The scrolling color beams are then transmitted to a light modulating panel in the projection system. Therefore, a single-panel projection system with color scrolling function is achieved.