To reduce a labor and trouble for making an analytic model of reinforcing cord.

This method for making the analytic model a twist structure includes for making a straight line analysis model in which wires constituting reinforcing layers (step S101), respectively, have straight line shapes and which can be analyzed with a computer; for setting a boundary condition for analyzing twisting (step S102); for executing a twisting analysis for the straight line analysis model in the set boundary condition to make twist models which are made for the reinforcing layers, respectively (step S103); for combining the twist models made with respect to the reinforcing layers (step S106); and for setting restraint conditions between the twist models or the like (step S108).