Objective:The aim of this study was to develop a frailty scale for the elderly in China and to examine its reliability and validity.Methods:The method of convenient sampling was used to select 375 elderly individuals in different communities of Tianjin,China.EuroQpl-5D was used to evaluate the criterion validity.Cronbach’s αcoefficients,correlation analysis,exploratory factor analysis,criterion-related validity,and internal consistency were used to evaluate the reliability and validity of the scale.To evaluate the test—retest reliability,30 old people were re-evaluated after 2 weeks.Results:The final version of the frailty scale(FI-35) consisted of 35 items.Eleven factors were extracted by a principal factor analysis and varimax rotation,with a cumulative contribution of 86.00%.Eleven dimensions were positively correlated(r = 0.130-0.541,P < 0.01).Cronbach’s α coefficient was 0.952,and the alpha coefficients of 11 dimensions ranged from 0.730 to 0.992.The test-retest reliability was0.874 for the total scale.The split-half reliability of the scale was 0.808.Structural equation modeling was used to perform a confirmatory factor analysis,and various parameters were all acceptable.Conclusions:FI-35 met the requirement of scale development and showed good reliability and validity;thus,it can be used as an efficient frailty measurement tool for Chinese elderly. Objective: The aim of this study was to develop a frailty scale for the elderly in China and to examine its reliability and validity. Methods: The method of convenient sampling was used to select 375 elderly individuals in different communities of Tianjin, China. EuroQpl- 5D was used to evaluate the criterion validity. Cronbach’s αcoefficients, correlation analysis, exploratory factor analysis, criterion-related validity, and internal consistency were used to evaluate the reliability and validity of the scale.To evaluate the test-retest reliability, 30 old people were re-evaluated after 2 weeks. Results: The final version of the frailty scale (FI-35) consisted of 35 items. Eleven factors were extracted by a principal factor analysis and varimax rotation, with a cumulative contribution of 86.00%. Eleven dimensions were positively correlated (r = 0.130-0.541, P <0.01) .Cronbach’s α coefficient was 0.952, and the alpha coefficients of 11 dimensions ranged from 0.730 to 0.992. The test-retest reliability wa s0.874 for the total scale. The split-half reliability of the scale was 0.808. Structural equation modeling was used to perform a confirmatory factor analysis, and various parameters were all acceptable. Conclusions: FI-35 met the requirement of scale development and showed good reliability and validity; thus, it can be used as an efficient frailty measurement tool for Chinese elderly.