Objective:To translate the Breast-feeding Social Support Scale (BSSS) into Chinese and to test its reliability and validity.Methods:This study was a cross-sectional study. The scale was sinicized using guideline for the cultural adjustment process recommended by American Academy of Orthopaedic Surgeons Evidence Based Medicine Committee. Using cluster sampling method, a total of 535 puerpera registered in 17 community health service centers in four communities of Chengde City were selected as the research objects from April to August 2023 to evaluate the reliability and validity of the scale. Critical ratio method and correlation coefficient method were used to analyze the item analysis of the scale. Internal consistency reliability, split-half reliability and retest reliability were used to test the reliability of the scale. The content validity index of item level and content validity index of scale level were used to test the content validity of the scale. Exploratory factor analysis and confirmatory factor analysis were used to test the structural validity of the scale.Results:A total of 535 questionnaires were sent out in this study, and 521 were effectively collected, with an effective recovery rate of 97.4% (521/535). The Chinese version of BSSS consisted of 11 items, and three common factors were extracted from the exploratory factors, and the cumulative variance contribution rate was 63.183%. The results of confirmatory factor analysis showed that the structural model of the three factors fit well. The Cronbach's α coefficient of the total scale was 0.866, the retest reliability coefficient was 0.815 and the split-half reliability coefficient was 0.813. The content validity index at the item level of the scale was 0.830-1.000, and the content validity index at the scale level was 0.820.Conclusions:The Chinese version of BSSS has good reliability and validity, which can be used as an evaluation tool for the social support level of breast-feeding in China.