The present invention discloses a method for simulating a graphics tablet based on pen shadow cues, the method applying to execution in a computer for simulating a graphics tablet and comprising the steps of: capturing an image; identifying a tablet from the image according to a predetermined tablet recognition procedure; identifying a pen entering the tablet according to a predetermined pen recognition procedure; and detecting a pen shadow of the pen according to a predetermined pen shadow recognition procedure and determining the relationship of contact and separation between the pen and the pen shadow for simulating the graphics tablet. Since the present invention can use a single webcam to simulate the graphics tablet, the drawbacks including inconvenience, heaviness, vulnerability and high cost of conventional graphics tablets can be overcome by the present invention.
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