Abstract: Technology for cutting wheat roots by mechanical method is from high-yield wheat cultivation practice, which is an important match technology for precision sowing and high production planting of winter wheat. Root-cutting method, models of hoe steels or cutting blades assembled, are the most important factors influencing root-cutting quality and yield-increasing effect. According to the requirements of agricultural planting measures, three root-cutting models were given as follows: model of hoe steels assembled, model of blades assembled, combined model of hoe steels & blades assembled. Root-cutting quality and yield- increasing effect were experimented on three root-cutting models. The experimental results show that three root-cutting models can evidently cut wheat roots and increase wheat yield, and the root-cutting ratio is 25.8%～42.1%, in comparison with the wheat field without cutting roots, the yield of winter wheat increased by 9.96%~11.41% on the average. Among the three root-cutting models, the combined model of hoe steels and blades assembled cut off the most roots from wheat with the root-cutting ratio of 42.1%, root-cutting depth 10.2 centimeters, which increased the roots to grow fastest after winter and the most yield was increased by 11.41%; with this model, root-cutting machine worked more stably, with no soil turning over and no harm to wheat plants after finishing root-cutting process. The combined model of hoe steels and blades assembled should be selected and applied firstly.