1200 patients with stage Ⅳ colorectal cancer,who had received surgery and chemotherapy,will be randomly divided into group A（receive CIK plus S-1 and Bevacizumab ) or group B（just receive S-1 and Bevacizumab),and the randomize ratio will be 1:1. Patients in group A will receive 3 cycles of CIK treatment (every 1 year) and Apatinib (continuous).Patients in group B will receive only S-1 and Bevacizumab (continuous) .
