The power of the rice combine harvester is generally 9-107kW. Therefore, the size of the selected model should be adapted to the size of the field and the condition of the centralized contiguous. If the field is flat, the field is large and the height difference is small, you should choose a larger model; if the field is small and scattered, you should choose a small harvester. If the small harvester is used in the small field, the efficiency of the harvester cannot be fully utilized; if the small harvester is used in the field, the productivity is low and it cannot meet the requirements of rapid harvest in the busy season.