The coordinate equation of a rotating cylinder as a main part of a kind of mixers was ascertained using coordinate transformation method.The movement contrails of the mixer heads were founded.

• 针对偏心圆筒混合机；运用坐标变换方法分析了旋转圆筒在任意时刻的坐标方程；得到了左右端盖质心的运动轨迹.；分析单个颗粒的圆周运动；得到了单个颗粒作部分圆周运动的临界角速度;