1. A gesture recognition method for an interactive system, the interactive system comprising at least one light source, a reflector and an image sensor configured to capture an image window comprising object images of at least one pointer caused by that the pointer occludes the light emitting from the light source and/or the reflector, the gesture recognition method comprising the steps of: capturing an image window with the image sensor; obtaining information of the object images in the image window; identifying whether there is a plurality of pointers present according to the information of the object images; and executing a gesture recognition according to a relation between the object images in the successive image windows when a plurality of pointers are identified.