The invention relates to a method for making a sofa with decorative patterns. At present, no method capable of realizing that selected decorative patterns can be placed at the optimal positions of the sofa before finishing making the sofa exists. The method for making the sofa with the decorative patterns, provided by the invention, comprises the following steps of: A, modeling a sofa model with a 3D effect by using software in a computer; B, selecting at least one decorative pattern for the sofa model with the 3D effect; C, performing 3D decorative effect rendering on the sofa model with the3D effect formed in the step B; D, determining a simulated decorative effect for the decorative patterns; E, respectively decomposing the decorative patterns on the sofa model with the 3D effect determined in the step D into corresponding sofa cover cutting pieces; F, making the sofa cutting pieces with planar decorative patterns; and G, stitching the sofa cutting pieces into a sofa cover/housing. In the invention, the decorative patterns selected by customers can be placed at the optimal positions of the sofa before beginning making the sofa, thus the function of an optimal decorative effectis achieved.