The advantages of an all-electric injection molding machine are energy saving, quieter, cleaner and more accurate. In recent years, the development of all-electric injection molding machines progress rapidly. The core technology of the all-electric injection molding machine is using servomotors to drive all the processes such as injection, clamping, plasticating et al.. The injection unit plays a very important role in the injection molding machine. The injection unit controls many parameters such as injection speed, injection pressure, packing pressure et al.. All the parameters will influence the quality of products. The tiebarless structure is used for the clamping unit in our machine. It can provide larger space for large molds in a smaller machine combined with quicker mold changes, Those advantages can save much time. This paper demonstrates our effort in designing and fabricating an all-electric tiebarless injection molding machine, which has six tons of clamping force.