Abstract: Abstract: Agricultural mechanization is an important part of the agricultural modernization, mechanization of crop harvesting is an important link of agricultural mechanization, increasing productivity of agricultural machinery can greatly reduce the cost of agricultural production. In this thesis, field trial and numerical simulation were adopted to find agricultural machinery working routes with higher harvesting productivity. First of all, the "U"-shape working route, the "concentric square" working route, and the "concentric square" and "U"-shape combined operation modes were selected from the commonly used harvesting routes. These routes were combine harvester operating routes with higher theoretical productivity without repeated routes. Secondly, the working time composition of the combine harvester was comprehensively analyzed. The running time of the combine harvester consisted of 3 parts: non-constant speed driving time (including the combine harvester entering the farmland, driving out of the farmland, decelerating before turning, accelerating after turning), constant speed driving time and total turning time. The total running time of the combine harvester was the sum of the running time of each part. On this basis, the productivity calculation model of the combine harvester under different running routes was built. In order to obtain the time parameters of each part, 3 kinds of combines with different power and header width were selected as test objects, the operation process was tracked, and the agricultural machinery operation was recorded when 3 different operation routes were used in different specifications field. Finally, 3 working route models including calculation models and measurement parameters were written by MATLAB. In the numerical simulation, 3 models, 3 operating routes, 2 field sizes, and different aspect ratios were considered, for a total of 474 combinations, MATLAB program was used to simulate the productivity of the combine harvester under all experimental combinations. The results showed that the main factors affecting the production capacity of the combine harvester were its type and working route, the field area and the aspect ratio. The productivity of the harvester could be improved by appropriately increasing the field area, aspect ratio and working width of the harvester. Within the scope of the simulation conditions, the "concentric square" and "U"-shape combined operation modes could increase the productivity of the combine harvester by more than 8%. The research results can provide some technical references for the practical path selection of agricultural machinery and the optimal layout of farmland systems.