Abstract: The traditional design method of rotary adjustable inductance relies heavily on physical iteration. This method has poor timeliness and economy. To meet the design requirements of rotary adjustable inductance, this paper proposes a design method of rotary adjustable inductance based on structural parameter analysis and Monte Carlo method. First, the analytical model of the rotating tunable inductance is established for the first time by using the coaxial ring. Based on the proposed model, the influence of structural parameters on the inductance value is analyzed, including wire radius, rotor radius, stator radius, rotor coil turns and stator coil turns. Furthermore, this paper proposes a design method of rotary adjustable inductance based on Monte Carlo method, and optimizes the algorithm by using the influence of inductance structure parameters to improve the search accuracy and convergence speed. Finally, simulation and experiment verify that the proposed method has the advantages of high design accuracy and fast convergence speed. This design method can effectively reduce the time and material cost required for the iterative design of inductors.