Disclosed is a method for the stage-by-stage pressure reduction of a three-phase fluid, wherein the three-phase fluid flows through pressure-reducing valves of at least two stages for the completion of pressure reduction in order to separate light components, the pressure of the three-phase fluid before the first pressure reduction is ≥ 15 MPa, the pressure of the three-phase fluid after the last pressure reduction is ≤ 5 Mpa, the content of each of a gas phase, a liquid phase and a solid phase in the three-phase fluid is ≥ 1 wt％. In the method for the stage-by-stage pressure reduction of the three-phase fluid, the fluid flows through pressure-reducing valves of at least two stages in order to separate light components, and this stage-by-stage pressure reduction reduces the pressure drop magnitude of each stage and can directly substantially decrease the degrees of expansion-type wearing and cavitation-type wearing on equipment and valves. Further disclosed are a use of the above-mentioned method for
