Leukostimulants are drugs that can increase the number of white blood cells in the peripheral blood and strengthen the patient’s resistance. There are two major types of clinical leukostimulants, one is oral leukostimulants and the other is injectable leukostimulants. Oral leukostimulants such as licoquinone, vitamin B4, shark liver alcohol, and powerful leukostimulants have similar mechanisms of action to raise white blood cells. Clinically, it is found that oral leukostimulants are less effective when used alone, and generally require two or more of them to be used in combination to achieve good therapeutic results. The most commonly used injectable leukostimulating drug is recombinant human granulocyte colony-stimulating factor, which has a variety of clinical uses. The mechanism of action is to promote the proliferation and division of granulocytes in the bone marrow and release them into the peripheral blood to effectively increase the number of leukocytes in the peripheral blood, which is often used in patients with severely reduced leukocyte count in the peripheral blood after radiotherapy.