Abstract: In an operation for winding a synthetic thread on a cylindrical bobbin for producing a full size yarn package at a winding speed more than 2500 m/min, the possible creation of defective yarn winding is positively prevented by increasing the tightness of the winding thread on a just previously formed thread layer of the yarn package, at least once in a predetermined period defined by a critical condition. Such predetermined period is defined by1.20.times.10.sup.-6 .ltoreq. (dw/dt)/D .ltoreq. 3.0.10.sup. -6wherein w represents the number of bobbin rotations per one reciprocal traverse motion, t represents the time in minutes and D represents the thickness of the thread in denier. The above-mentioned winding tightness is created by intentionally increasing the winding yarn tenson and/or increasing the contact pressure of the yarn package with a friction driving roller.