The analysis of designs of domestic and foreign ground-throwing machines and conducted research on extinguishing a forest grass-roots fire by throwing soil. It is established that for carrying out high-quality preventive and forest fire works, it is advisable to use technical means that combine active and passive working bodies in their design. This will allow combining the process of pre-treatment of soil and further release of loosened soil in a given direction, as well as significantly increase the efficiency of the technological process of creating mineralized strips. Based on the mathematical model, the working surfaces of the soil-laying machine are represented as a set of elementary triangles with vertex coordinates and the nature of soil movement is studied. The main part of the flying soil (about 70 %) settles in the band from 1.5 to 3.0 m from the border of the machine. However, part of the ground gets a high initial velocity and such an angle of release that it reaches a distance of 20 to 40 m. To study the movement of the elements of the ground-thrower, equations of motion of the mechanical system in the form of Lagrange equations of the second kind are compiled. It was found that when the values of the depth of the casing-Ripper are from 0.25 to 0.3 m, the best indicators of the range of soil discharge and productivity are observed (20 m and 0.07 m3 / s, respectively), and the power consumption is in the permissible range (17 kW). It is concluded that the ground-throwing equipment should be considered only as part of a combined machine that will allow you to remove the forest floor from the path of the unit, preventing its release into the fire zone, and protecting the working bodies of the unit from the root system of trees. The highly efficient design of the unit with technical solutions is proposed, which allows performing work on stopping and localizing fire.