Abstract: Abstract: The successful development of this machine can provide an efficient, safe and reliable device for the ramie fiber opening and washing. It can also greatly reduce the requirement of operator technology and the work intensity, but improve the working environment. While it provides a basis not only for the upgrading and updating of ramie processing equipment but also for the scale and Standardized development of ramie production, shows a new design idea for the opening and washing of other degummed fiber at the same time. The problems of fiber opening and washing after the degumming of ramie have plagued the development of the industry for a long time. At present, because of the high labor intensity and low efficiency of manual cleaning, it is the inevitable choice to achieve the goals of mechanized and efficient water washing. Focusing on the problems of follow-up processing of degummed fiber, many technicians both here and abroad have designed many types of ramie opening machines, such as traditional circular knocking machine, rotary hammer type fiber opening machine and ramie fiber washing machine. But now people still use the traditional circular knocking machine to open the fiber and wash it in another machine, which depends on the operators' experience to flip the fiber in the process of knocking and opening the fiber. But, the operators cannot flip so symmetrically because of the bad working environment that the opening machine misses some knockings, which results in the bad uniformity of ramie fiber. According to the technical requirements of ramie fiber automatic production, the ZMFQSL?1 type ramie fiber opening and washing machine was designed and manufactured. This prototype mainly consists of opening device, intermittent transportation device, gathering device, washing device, and system of water circulation. It adopts the combination of the opening device and intermittent transportation device to realize the process of fiber strip-shaped linear intermittent transportation, knocking and opening, and intermittent transportation. By using eccentric design of cam and cam follower assembly, the opening device can realize the hammer's free falling motion and finish the knocking and opening of the ramie fiber. Washing device is made up of 5 sets of washing mechanisms which are in ladder arrangement, and it can complete the washing process of the ramie fiber by the pressure water washing of 2 sides during the conveying and the extrusion of the pressure roll, which achieves the further opening and washing of fiber as well as the recycling of water resource, and at the same time increases the feasibility of the popularizing of the prototype. The size of the prototype (length × width × height) is 12 000 mm × 1 100 mm × 1 780 mm, and its power of electric machinery is 14 kW. The operation widths of opening device and washing device are 850 mm, and the nozzle pressure of the washing device is 1.2 MPa. Experiment result shows that the machine works stably and performs reliably, the productivity is more than 120 kg/h and the quality of ramie fiber is uniform, the average residual gum content is less than 2.0%, the Bundle-fiber breaking force is 4.3 cN/dtex, and the splitting rate is less than 2‰, and every indicator of performance meets or exceeds the related standards. The successful development of this machine can provide an efficient, safe and reliable device for the ramie fiber opening and washing. It can also greatly reduce the requirement of operator technology and the work intensity, and improve the working environment. It provides a basis not only for the upgrading and updating of ramie processing equipment but also for the scale and standardized development of ramie production, and shows a new design idea for the opening and washing of other degummed fiber at the same time.