Prostatic hyperplasia is common and frequent in middle-aged and elderly men, because of its slow onset, long course and easy recurrence, the clinical efficacy is often not satisfactory, and the quality of life of patients is affected to varying degrees, so early prevention and treatment is of great significance to prostatic hyperplasia. Based on the theory of "preventive treatment" in traditional Chinese medicine, its effect of the theory of "preventive treatment" in prostatic hyperplasia of traditional Chinese medicine is discussed from three aspects: "prevention before disease", "prevention of pre-existing diseases" and "prevention and recovery after malaria".