Discontinuous tape winding,which has obvious advantages in large extension ratio winding,is widely used in the molding of composites,Therefore,the research on technological parameters becomes the focus of many scholars.However,how to accomplish the variable tension control is usually not fully considered.Accordingly,the constant extension ratio and the smoothness of winding process cannot be ensured.Aiming at the problem of tension control,this paper first gives a comparatively deep research on the control method and the interaction mechanism of tension,extension ratio,automatic lap and automatic rectification.Then,according to the winding process features,the mechanical device and the mathematical model of tension control system are established respectively.With regard to the characteristics of PID controller and fuzzy controller,the fuzzy self-tuning PID controller is designed.As a result,the variable tension control is realized during the winding and lapping process,and the constant extension ratio is guaranteed.Finally,a sample application is presented for demonstration.By presenting the variable tension control techniques for discontinuous tape winding,the constant extension ratio of tapes is achieved,the consecution and the automation degree of winding process is improved as well.Thus,the quality of wound products is guaranteed.