In 1991 TWI of the United Kingdom invented friction stir welding (FSW) technology and was granted its patent. This welding technology is featured with many outstanding characteristics, such as low pollution, energy saving, low distortion, high joining strength and high production efficiency. FSW is especially suitable for light metal applications, including Al alloy and Mg alloy, and can even weld 2XXX & 7XXX series Al alloy that can’t be welded by conventional fusion welding processes. MIRDC has been licensed by TWI for implementation of FSW since 2004, introduces this technology to Taiwan industries ever since. MIRDC has established several different types of FSW equipments and technology database by executing development projects. Presently the FSW projects has finished the development of FSW technology for 6061, 7075 and 5083 Al alloys, with material thickness ranging from 1.5 to 25 mm, welding distortion ? 0.5 mm/m and welding efficiency ? 75 %, and also established multi-axis Robot FSW system, horizontal type FSW system and vertical type FSW system, having similar capabilities as those systems in global advanced R&D organizations, such as EWI and TWI. So far, the developed technology has been used for manufacturing of several commercial products; such as Al alloy missile launch box, Al alloy heater, and Cu backing plate of sputtering target. These technologies not only accelerate domestic manufacturing of some key components of important industries, but also assist these industries to develop innovative and high value added products.