Friction stir channeling process（FSCP） is a patented solid-state process technology to produce sub-surface channels in monolithic aluminum components in a single step,it can be used for forming internal fluid channel and reducing weight in components. The technical progress of FSCP,and the process technology principle and application problems of a new TWI invention--stationary shoulder FSCP technology manufacturing aluminum alloy liquid cooling flow channel are intro-duced. Through the welding process analysis and X ray tomography detection, the results show that the geometry,rotation speed,feed speed and vertical force of the stirring tool are the key technology factors affecting the forming of liquid cooling channel. The metal section on the retreat side of the channel presents an irregular interface shape due to the mixing and extrusion and the plasticizing flow of the metal during the friction stir process.