92%。 A power driven cutting mechanism of ridge-till and no-till corn planter was designed to treat rootstalk during no-till plant corn in the areas of one crop a year. Three rows blades are fitted on the axis for one ridge in this mechanism. Three kinds of spindle-harnesses and three kinds of blade-installations were designed in order to find out a most reasonable form. The soil bin experimentation showed that the mechanism has a good ability to cut corn rootstalks, when the running speed is 0.75km/h, the rotor speed is 150r/min and the blade-installation is ZH2. The experimentation for choosing spindle-harnesses showed that the second spindle harness which has better cutting ability and lower power consumption is the best choice.