Abstract: Virus-based anti-tumor therapies are novel biological treatments. Viral vectors can infect tumors to kill cancers directly (on-colysis), act as cancer vaccines to activate the immune system, and deliver genes with anti-tumor activity to the cancer cells. Genetic engineering has been applied to viruses to achieve more specific and efficient cancer treatment. Simultaneously, a reasonable combi-nation of viral vectors and existing anti-tumor therapy can improve the therapeutic effect. Consequently, virus-based therapy is expect-ed to serve as an effective anti-tumor strategy. We reviewed recent studies on the anti-tumor viral therapy of colorectal carcinoma.