The knobless cylinders of Montessori work is general consist of 4 colors(blue, red, yellow, green) cylinder. Each color has 10 cylinders putted into the wooden box with the same color. This is the sensorial work of Montessori Education. Before kids learn the work, they usually distinguish the color first. It can not only cultivate their visual concept for identifying the size, color, it also can exercise their hand-eye coordination, concentration, arm muscle control and observation. During work, kids match the cylinders according to teacher's presentation. If the cylinder or the color can't be match, kids should reselect. This is the error control of Montessori work. Through this series of work, it can better develop the sensitivity of colors and shapes and the concept of size recognition.When kids mastered the basis of work, they can attempt to transform the sequence of operation.