Paddy threshing is a key link in rice harvesting,it is unavoidable that the damnification of the rice occured in the process of the rice threshing as a result of an affection of a rigid impacting and it leads to a serious affluence in reprocessing to rice and rice seeds production and a great con-effect on the comprehensive benefit for rice production.so the research of the damaging causes in rice threshing is deeply concerned.In this paper it was analyzed on the basis of the situation of the development at home and abroad.and the controlling methods about threshing damnification will be worth...
