A junction line data generation method includes scanning a first junction component and a second junction component by using an image capturing device for generating three-dimensional first junction component modeling data of the first junction component and generating three-dimensional second junction component modeling data of the second junction component, simulating a first junction component structure by using the three-dimensional first junction component modeling data, simulating a second junction component structure by using the three-dimensional second junction component modeling data, and generating junction line data between the first junction component and the second junction component by optionally deforming the first junction component structure and/or the second junction component structure according to the first junction component structure and the second junction component structure.