Abstract: The test & research of droppings rate were carried on with gill pin licker-in carding machine.The change of droppings rate was mainly studied by different working angles of gill pin licker-in and saw-toothed licker-in at different working speeds.As a result of the experiments,the working angles of gill pin have certain influence on droppings rate of gill pin licker-in carding machine.When the working angles are between 58 and 66 degrees,there are almost no difference between its droppings rate and that of saw-toothed licker-in.However,when the working angle of gill pin is at 73 degrees,its droppings rate is obviously higher than that of saw-toothed licker-in.Smooth surface of gill pin and small friction coefficient are essential reasons for higher droppings rate of gill pin licker-in carding machine.