To meet the development trend of multi-bar warp knitting machine towards high speed, advanced technology and computer control and the requirements of various products with small quantity, there are many researches done on the computer-aided pattern design of multi-bar warp knitted fabrics. In terms of the special properties of the computer-aided pattern design of multi-bar warp knitted fabrics, the Object Oriented Program (OOP) programming-Object Windows class Library (OWL) programming is selected. According to the characters of the OWL programming, various functions are defined. Pattern design and technical parameters can be output, which offers a great convenience for the factory.