As a precision machine. Types of production machines, flat terry socks knitting machine production speed is faster than arbitrarily terry socks knitting machine. And more time will increase for company .Therefore, by improving the performance of arbitrarily terry socks knitting machine needle efficiency, to raise the production efficiency of manufactures socks. This study Computer-Aided Design, Computer-Aided Electronic, Reverse Engineering to investigate manufacture points of difference and limit in the arbitrarily terry with flat terry and sinker, as direction of improvement. According to the study results, arbitrarily terry socks knitting machine and sinker is point. Hence, This study toward this part is improved to raise the manufacture efficiency of arbitrarily terry socks knitting machine to stability.