Abstract: In this paper the key technology about the motions of the looping elements in a warp knitting machine with multi-guide bars is intensively studied. The process of the loop-forming, moving requirements of the looping elements are analyzed, and the structures of the mechanisms which meet the moving requirements are synthesized. The time ratio of the oscillation of the bars, the dynamics optimization of the cam mechanisms that drive looping elements, and the phase angles of different looping elements mechanisms are the key technologies when developing a warp knitting machine with multi-guide bars. These three key technologies mentioned above are also given a highly emphases on in the paper, and they act as the theory basis in the development of a high-performance warp knitting machine with multi-guide bars. The production application experiences show that these key technologies have tremendous impact on the product technology performance.