Abstract: Currently,in the process of blood smears preparation, the blood samples are directly obtained from the open bottle. Due to the inconvenience of operation, mistakes are often made and the operation of pushing piece always fails. In order to overcome the shortcomings of existing technology, a pushing piece dripping pen used in blood smear preparation is developed in this study which consists of three parts including pen body, dripping head and the pushing plate components. The dripping head is set on the opening of the pen body with an inner diameter of 0.2-0.3 mm. The pushing plate components consist of a fixing sleeve and a pushing plate which is fixed in the fixing sleeve, and the fixing sleeve is set on the bottom of the pen body. Because the dripping of the blood samples is made by using dripping head, the dripping volume is easy to control and the operation is convenient. The structure of the pushing component being sleeve-connected to the pen body makes it easier to perform piece pushing and is convenient to be replaced. The application of the developed device provides assurance for the performance of teaching and experiment.