Plastic flow of crystalline helium was investigated in the temperature range 0.6-2. ΓΚ at pressures 25.7-40 atm and at absolute deformation rates 5·10~¹⁰-10⁶ cm/sec. The dependences of the deformation rate on the applied force and on the temperature were measured. It is concluded on the basis of tl obtained data that the plastic deformation is of dislocation origin.