| China is largest country of growing potato in the world, However, the mechanization of potato harvest is in the low level. In recent years, the development and popularization of potato harvester has made great progress, but the most harvesters belong to section, the potato picked up by men, , graded by handwork when necessary, low productivity, large labor intension, and the overall low level of mechanization, seriously hinder the further development of the potato industry. So the 4U-1400FD potato harvester with a grading device was researched. This machine can complete potato digging, potato and soil separation, potato cleaning, grading and bagging process in one time, the labor intension of human can substantially reduce, labor cost and the processing sectors of commodity potato were reduced, the production efficiency was significantly improved and the ratio of the injured potato was reduced.According to the function of the machine and the technical requirements of potato harvester and classification, the virtual prototype model was established by using 3D modeling software Pro / E, the device of grading and bagging of 4U-1400FD potato harvester and the frame were mainly researched and designed, including the principle design of grading and bagging device, and the structure design of frame. The main components were analyzed and its intension was checked and the chain wheel and frame were analyzed with software ANSYS, the stress distribution,the maximum stress and the resulting parts were analyzed in the working speed of 3km/h to 4.83km / h. The calculation results and the prototype test results show that the design of the principle and structure of grading and bagging device and the structure of frame are reasonable; the grading accuracy is higher, work well; the strength reserves of the frame is adequate, and it can work safely and reliably. The software of AutoCAD was used to complete the component draft drawings of the machine.
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