本文报告多原发性大肠癌6例,占同期手术治疗的大肠癌的1.4%,其中同时癌4例,异时癌及异时同时癌各1例。6例中3例伴有腺瘤。对多原发性大肠癌的存在及腺瘤恶变重视不够,检查手段的缺陷是病员不能得到早期及适当治疗的重要原因。 This article reports 6 cases of multiple primary colorectal cancer, accounting for 1.4% of colorectal cancer surgical treatment in the same period, including 4 cases of simultaneous cancer, different time cancer and different time and concurrent cancer in 1 case. Three of the 6 cases had adenomas. The lack of attention to the presence of multiple primary colorectal cancers and the malignant transformation of adenomas, and the defect of the examination methods, are important reasons why patients cannot get early and appropriate treatment.