Abstract: A window split system and method. The window split system includes a window, a splitter, and a module. The splitter is set on the window to split the window into a first part and a second part according to the split direction and the position of the splitter. The module changes the split direction of the splitter in response to a direction, such that the window is then split by the splitter in the changed split direction. The split direction is changed if the splitter touches the border of the window, if the splitter is double clicked by a pointing device, and if a control object connected to the end of the splitter and set around the border of the window moves across the corner of the window.