The invention discloses new application of a ginseng extract, ginsenoside and a ginsenoside derivative in the preparation of a medicine for treating HCMV infection related diseases. The related diseases comprise HCMV infection caused in the process of treating cardiovascular and cerebrovascular diseases, organ transplantation, perinatal periods, tumors, burn, AIDS and other diseases of patients. Tests prove that the ginseng extract, the ginsenoside and the ginsenoside derivative have a remarkable curative effect, quick response and a small toxic or side effect during treatment of HCMV infected diseases, are a medicine or a health product for treating the HCMV infection, which is safe, efficient and stable and has a simple preparation process, and are suitable for industrial production and easy to popularize. In the invention, a new medicine source is provided for the treatment of the HCMV infection.