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Objective:We aimed to establish a scoring system to predict the risk of breast cancer-related lymphedema.Methods:From April 2017 to December 2018,533 patients who previously underwent surgery for breast cancer were enrolled in this cross-sectional study.Univariate analysis was performed to explore and define the risk factors.A scoring system was then established on the basis of odds ratio values in the regression analysis.Results:The additive scoring system values ranged from 6 to 22.The receiver operating characteristic (ROC) curve of this scoring system showed a sensitivity and specificity of 83.3％ and 57.3％,respectively,to predict the risk of lymphedema at a cut-off of 15.5 points;the area under the curve was 0.736 (95％ confidence interval:0.662-0.811),with x2 =5.134 (P =0274) for the Hosmer-Lemeshow test.Conclusions:The predictive efficiency and accuracy of the scoring system were acceptable,and the system could be used to predict and screen groups at high risk for breast cancer-related lymphedema.