A 40-year-old male was admitted to the hospital with acquired immunodeficiency syndrome (AIDS) and Pneumocystis carinii pneumonia (PCP). Two months before admission the patient had a high fever, general fatigue and mild epigastic tenderness. On admission, physical examination revealed numerous small tumors on the head, gingiva, neck, nasal ala, anterior forehead, anterior thoracic, bilateral sole and bilateral lower limbs. At that time, the CD4 cell count was 130/microliters. Upper GI endoscopy was performed because of sever epigastralgia and hematemesis. The gastric mucosa was diffusely nodular and erythematous with bleeding. This biopsy showed Kaposi's sarcoma, and the same findings were obtained from the duodenum, rectum and skin, AIDS with related cutaneous and gastrointestinal KS and PCP was diagnosed. We performed a combination of chemotherapy and Interferon-alpha therapy, and the KS almost completely disappeared within 3 months.