A computer-implemented method for analyzing the distribution of the ground-contact pressure of a tire using a three-dimensional tire model, said tire model modeling a pneumatic tire having a toroidal main body and a circumferentially extending tread pattern formed thereon, said modeling comprising a step for setting a three-dimensional main body model by dividing the main body by N equally in a circumferential direction of the tire using a finite number of elements, wherein N is an integer not less than 2, a step for setting a three-dimensional pattern model by dividing the tread pattern by M equally in the circumferential direction of the tire using a finite number of elements, wherein M is an integer greater than N, a step for coupling the pattern model with the main body model such that their tire rotation axes are aligned to each other to make a three-dimensional tire model, and a correcting step for moving nodal points existing on a radially outer surface of the pattern model such that a thickness of the pattern model measured from a radially outer surface of the main body model in a normal direction becomes constant, wherein the correcting step includes selecting one of the nodal points on the radially outer surface of the pattern model, calculating a radius of the selected nodal point from the tire rotation axis, obtaining, when an element of the body model existing radially inside of the nodal point is located at n-th position from an arbitrarily determined reference position, an angle theta of the circumferential direction of the tire from the nodal point to a boundary plane between an element of the body model located at n-1-th position from the reference position and the n-th element of the main body model, calculating a new radius of the nodal point to make a thickness of the pattern model constant using the angle theta, and moving the nodal point to coordinates having the new radius, wherein the tread pattern of the pneumatic tire includes a tread groove having a longitudinal groove extending in the circumferential direction of the tire and a lateral groove extending in a direction intersecting with the longitudinal groove, the pattern model is made such that at least one of the tread grooves of the tread pattern is omitted, the method further includes a step for defining a rubber physical property in each element of the pattern model, and the rubber physical property is calculated based on a rubber physical property of the tread pattern of the pneumatic tire and a capacity of the omitted tread groove, carrying out a simulation by providing said tire model, and obtaining a ground-contact pressure as a result of said simulation. a step for setting a three-dimensional main body model by dividing the main body by N equally in a circumferential direction of the tire using a finite number of elements, wherein N is an integer not less than 2, a step for setting a three-dimensional pattern model by dividing the tread pattern by M equally in the circumferential direction of the tire using a finite number of elements, wherein M is an integer greater than N, a step for coupling the pattern model with the main body model such that their tire rotation axes are aligned to each other to make a three-dimensional tire model, and a correcting step for moving nodal points existing on a radially outer surface of the pattern model such that a thickness of the pattern model measured from a radially outer surface of the main body model in a normal direction becomes constant, wherein the correcting step includes selecting one of the nodal points on the radially outer surface of the pattern model, calculating a radius of the selected nodal point from the tire rotation axis, obtaining, when an element of the body model existing radially inside of the nodal point is located at n-th position from an arbitrarily determined reference position, an angle theta of the circumferential direction of the tire from the nodal point to a boundary plane between an element of the body model located at n-1-th position from the reference position and the n-th element of the main body model, calculating a new radius of the nodal point to make a thickness of the pattern model constant using the angle theta, and moving the nodal point to coordinates having the new radius, wherein the tread pattern of the pneumatic tire includes a tread groove having a longitudinal groove extending in the circumferential direction of the tire and a lateral groove extending in a direction intersecting with the longitudinal groove, the pattern model is made such that at least one of the tread grooves of the tread pattern is omitted, the method further includes a step for defining a rubber physical property in each element of the pattern model, and the rubber physical property is calculated based on a rubber physical property of the tread pattern of the pneumatic tire and a capacity of the omitted tread groove, carrying out a simulation by providing said tire model, and obtaining a ground-contact pressure as a result of said simulation.