Wireless control method and system for projection demonstration

The invention relates to a wireless control method and system for projection demonstration. The system comprises a projection screen, a projector, a vidicon, a laser pen, a wireless receiver, an image acquisition unit, a cursor positioning unit, a signal receiving unit and a synthetic processing unit, wherein the laser pen is used for transmitting laser to the projection screen to form a laser spot and transmitting key action information to the wireless receiver; the vidicon is used for capturing a projection screen image in real time and transmitting the projection screen image to the image acquisition unit; the image acquisition unit is used for transmitting image data to the cursor positioning unit; the cursor positioning unit is used for calculating the screen boundary, recognizing the laser spot, determining relative coordinates of the laser spot, mapping the relative coordinates into cursor coordinates and transmitting the cursor coordinates to the synthetic processing unit; the wireless receiver is used for receiving and processing key action information and transmitting the key action information to the signal receiving unit; the signal receiving unit is used for receiving the processed key action information and transmitting the processed key action information to the synthetic processing unit; and the synthetic processing unit is used for synthesizing an integral operation event. According to the system disclosed by the invention, the operation can be quickly and accurately realized by using the laser pen.