Abstract: The content introduces the principle of setting machines.For the problem of bad dynamic performance and weak ability of the dynamic performance of tenter tension,the digital filtering two degree of freedom PID control algorithm was designed,result the overshoot of the system reduced to 1.3%,the adjustment time shortened to 5s and the steady error was controlled in(80±1.1)kN.In the light of the large initial error of stretching tension leads to integral accumulation and eventually cause the system oscillatory or divergent,the integral separation PID control algorithm was designed and result was controlled within the process requirements of the 20N and effectively reduced the stretching tension overshoot.The rear spindle position was controlled within 20mm and stretching tension and synchronous coupling control were realized.

Key words: setting machines, overshoot, integral separate PID, synchronous control