The authors treated 31 cases of stomatological complications of acute leukemia with Chinese herbal drugs. It was found that the prevalence of oral mucosal ulcers was the highest (80%) in acute lymphocytic leukemia, and the prevalence of gingival swelling was the highest (44%) in acute monocytic leukemia. In accordance with symptom differentiation, Qing Wei San (Powder for Clearing Stomach-heat) with modifications was administered in cases of exuberance and Yü Nü Jian (Gypsum Decoction) with modifications was administered in cases of deficiency, plus gargling solution and hemostatic powder for external use. As a result, 7 cases (22.6%) were markedly effective, and 19 cases (61.3%) effective, the total effective rate being 83.9%. The authors believed that stomatological complications of leukemia were due to insufficiency of yin and blood in the body or to the toxicity and heat of anti-neoplastic medication, and the Chinese herbal drugs were to replenish yin and clear the heat.