Touch screen is the most simple and direct way to interact with computers. Although it was born in 1970, is a new technology by elotouchsystems company to promote the market, but it is the most basic interactive way. You can point to any place you need. Adults or children can use it directly. The function of the touch screen has been successfully developed and applied in a wide range of business areas, with the use of the touch screen to simulate the operation of the aircraft to train their pilots. The real estate businessmen with a touch screen so that buyers can map color effect house is convenient for selecting with finger click. Greeting card companies use touch screen to allow customers to create their own personalized greeting cards. The hotel catering industry uses them to simplify the operation to achieve the purpose of click sales. It is also used by medical schools to train their students so that they can cope with emergencies. Although it has been applied in industry, but the basic function of the touch screen has never changed. The touch screen makes it possible for a person who has not been trained to use the computer immediately. Users can choose to click on the defined menu, so the touch-screen technology virtually eliminates user operation on the wrong wrong. Touch screen technology eliminates the cumbersome and is from the keyboard and mouse wanger. The touch screen is strong enough to withstand a lot of harsh environments, and it is easy to damage the keyboard and mouse. Touch screen technology is the fastest way to reach all digital media, it does not require cumbersome text description. Touch screen technology does not need to add other input devices on the desktop and anywhere else, because the input device has been integrated into the display.