Background: Malnutrition is common in cancer patients. The NUTRISCORE was a newly developed cancer-specific nutritional screening tool and validated by reference to the Patient-Generated Subjective Global Assessment (PG-SGA) and Malnutrition Screening Tool (MST) in Spain. We aimed to evaluate the performance of NUTRISCORE, MST, and PG-SGA in estimating the risk of malnutrition in Chinese cancer patients.Methods: Data from an open parallel and multicenter cross-section study in 29 clinical teaching hospitals in 14 Chinese cities were used. Cancer patients were assessed for malnutrition using PG-SGA, NUTRISCORE, and MST. The sensitivity, specificity, and areas under the receiver operating characteristic curve were estimated for NUTRISCORE and MST using PG-SGA as a reference.Results: A total of 1000 cancer patients were included. The mean age was 55.9 (19 to 92 years), and 47.5% were male. 450 patients (45.0%) had PG-SGA B and C, 29 patients (2.9%) had a NUTRISCORE ≥ 5, and 367 patients (36.7%) had MST ≥ 2. With PG-SGA as a reference method, the sensitivity, specificity, and area under the curve values of the NUTRISCORE was 6.2 %, 99.8%, and 0.53, respectively. The sensitivity, specificity, and area under the curve values of the MST were 50.9%, 74.9%, and 0.63, respectively. The kappa index between NUTRISCORE and the PG-SGA were 0.066 and 0.262 between MST and the PG-SGA (P < 0.05).Conclusions: NUTRISCORE was found a higher specificity and lower sensitivity compared with MST using PG-SGA as a reference method in cancer patients in China. Further studies are needed.