Abstract: The threshing method and power consumption are important influence factors for threshing rate and damage rate of rape seeds during threshing, which are the keys for design of threshing and separating system of rape combine harvester. The different threshing methods for rape seeds with rubbing, rolling and impact were tested. The relation of threshing rate and damage rate of rape seeds was studied and the threshing effect was analyzed. The test results showed that threshing rate appeared a logarithm relation with power consumption. The threshing effect of rubbing was better than the other methods when power consumption was more than 0.5?J/g. The rubbing method combined with impact method was recommended for rape seeds threshing mechanism. The research can provide a reference for selection of appropriate threshing method and structure design of rape combine harvester.