Abstract: Aiming at the problem that large and medium-sized combined harvesters are not suitable for harvesting operations and combined rice and rape harvesting in the hilly and mountainous areas of southern China, we designed a light-weight rice and rape combined harvester suitable for hilly areas, and focused on the dual control type full hydraulic small crawler chassis, full hydraulic rice and rape combined harvester and negative pressure suction and cyclone screen combined cleaning mechanism and other key parts for the program innovation and size optimization.The results showed that, the rider-tail dual operation mode and full hydraulic differential chassis of this harvester can be well adapted to the operation needs of small scattered fields in hilly areas, it is easy to install and remove the vertical cutter when harvesting rice and rape, all performance indicators such as total loss rate, impurity rate, and crushing rate of rice and rape during harvesting operations have reached the requirements, providing new equipment for solving the combined harvesting of rice and rape in hilly areas.