According to the problems of the large subsoiler resistance and no obvious effect of reducing drag,a vertical deep loosening tool is designed based on the principle of rotary cutting. The 3 determined working parameters of cutting tool are analyzed,and the minimum angular velocity of the cutting tool is calculated. Based on the SPH method,the tool of cutting soil model is established. The simulation analysis of the deep loosening process is carried out with the Ls-dyna software. The cutting resistance in different circumstance is simulated on the basis of the 3 factor and 3 level orthogonal ex...