This paper analyses the loop-forming process and the kinematical requirements for the latch needle, sinker bar and guide bar on doublewarp knitting machine. The latch needle and sinker bar are required to rise from its lowest position to its highest position, dwell at the highest position, return to its lowest position, and dwell at the lowest position. The motion of the guide bar is composed of two parts, one is oscillating with three times in a cycle, the other is required to rise from its lowest position to its highest position. These moving requirements are the basis for designing the loop-forming requirements on a doublewarp knitting machine.