Abstract:In view of the great loss of the headers and the jam of the threshing device due to the thick rapeseed stalks, a new rapeseed combine harvester with the function of preliminary cutting and separation as well as the traditional incision and pushing has been designed.The parameters of structure and operation of its critical components have been defined. The test showed that the header has an integrated function of cutting, dialing the grain, pushing, preliminarily cutting and threshing. The rapeseed stalks can be cut into pieces less than 450 mm， so the blocking of threshing device can be effectively prevented，and the reliability, stability and adaptability of the rapeseed combine was greatly improved.