Nutritional status of 118 cancer patients treated in Hai Phong oncology center were investigated by Subjective Global Assessment. The result showed: BMI 18 accounted for 17 percent. Good, moderate and mal nutritional status were 58 percent, 23 percent and 19 percent respectively. 45 percent well understand the role of nutritionin cancer treatrnent, meanwhile, 21 percent did not know. The role of nutrition in cancer should be educated to improve the effect of treatment.