For the problem of breaking stalk with hit shear type and stubble with double shafts, the principle of press chop type with single shafe and the models of chopping with knife of different radius are put forward. The key parameters of chopper are optimized. The outcome of field test shows that the rate of chopping is up to 91.4% as well as breaking 86.5% stubble. The application of this chopper is surely promoting technology of reservative tillage in dryland.