Method for displaying connecting line of touch screen

The invention discloses a method for displaying a connecting line, which is suitable for a touch screen. The method comprises the following steps of: storing a plurality of historical touch positions on the touch screen; displaying a line passing through the historical touch positions on the touch screen; forecasting a direction factor and a position factor according to the historical touch positions; generating a forecasting interval according to the direction factor and the position factor; detecting the next touch position; and when the next touch position is in the forecasting interval, displaying the connecting line between the last touch position and the next touch position of the historical touch positions on the screen. The method for displaying the connecting line of the touch screen can still accurately connect touch tracks even if the moving speed of a user or an object on the screen is in modes of constant speed movement, nonconstant speed movement and even non-linear movement (such as curve movem