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Objective The patient-generated subjective global assessment(PG-SGA)is a nutritional assessment tool specially designed for cancer patients.This study tested the validity of the PG-SGA for the nutritional assessment of colorectal cancer(CRC)patients in China.Methods A total of 8,093 Chinese patients with any stage CRC were enrolled in this cross-sectional,observational study.Within the first 48 hours of admission,patients were evaluated using the PG-SGA,nutritional risk screening 2002(NRS 2002),Karnofsky Performance Status(KPS),and some anthropometric parameters,including the triceps skinfold thickness(TSF),mid-arm circumference(MAC),mid-arm muscle circumference(MAMC),hand grip strength(HGS),maximum left calf circumference(MLCC),and maximum right calf circumference(MRCC),among others.Spearman\'s correlation test was performed to analyze item-total score correlations and correlations between the total PG-SGA score and other parameters or performance scores,further testing convergent validity.The discriminative ability of the PG-SGA was measured by comparing different characteristics between several nutritional groups.A principal component analysis was performed with selected parameters to evaluate the construct validity.Results The average total PG-SGA score of all patients was 5.69±4.46,and they had a median age of 59 years(interquartile range(IQR),51-67 years)and an average body mass index(BMI)of 22.57±3.29 kg/m2.The item-total correlations of the total PG-SGA score between the global PG-SGA rating(Spearman,r=0.94)and PG-SGA score(patient-generated)(Spearman,r=0.97)were strong.Significant correlations were also found between the total PG-SGA score and other nutritional screening tools,including the BMI(Spearman,r=-0.26),KPS(Spearman,r=-0.36),and NRS 2002(Spearman,r=-0.47).Well-nourished(41.2％),mildly or moderately malnourished(35.3％)and severely malnourished(23.5％)groups defined according to the PG-SGA had significantly different characteristics.Patients with a worse nutritional status tended to have a decreased BMI(well-nourished,23.32 kg/m2 vs.mildly or moderately malnourished,22.52 kg/m2 vs.severely malnourished,21.35 kg/m2;P＜0.001),hemoglobin,body fat mass,muscle mass,protein mass,TSF,MAC,HGS,MAMC,and MLCC,and a dramatically increased C-reactive protein level.The Kaiser-Meyer-Olkin measure was＞0.7,and the P value of Bartlett\'s test of sphericity was＜0.001.One component was extracted by the principal component analysis,and the analysis showed that the total PG-SGA score explained the total variances of 97.3％.Conclusion The PG-SGA is a valid tool for evaluating the nutritional status for Chinese CRC patients.