Warp-knitted brushed fabrics are special pile fabrics with uneven and declining piles that consist of broken filament ends. It is difficult to predict the finial pattern of the pile surface in the process of the design of patterned fabric. There are few researches on computer simulation of the fabric because of their complicated and fuzzy characteristic. This paper focuses on computer simulation of this group of pile fabrics. Firstly, the characteristics of warp-knitted brushed fabric and the factors that influence the pile are discussed. Secondly, a simplified line model is proposed to represent the shape of the pile by some lines in a certain titling angle, radial angle and length. A two-dimensional matrix is used to describe the position and color of piles in one pattern repeat. Finally, based on the mathematic model, a program is developed by VC++.NET to realize the simulation of the brushed fabric with a patterned pile. By the input of some parameters that were adjusted according to the craft, the two-dimensional computer simulation of the pile surface was found to be similar to the actual patterned pile fabric. It is proved that the method is feasible and contributes to the development of a computer-aided design system to realize the design and simulation of the warp-knitted brushed fabric.