Objective To assess the reliability and validity of the simplified Chinese version of the Multifocal Approach to Sharing in Shared Decision Making Questionnaire（MAPPIN′SDM）.Methods The MAPPIN′SDM was translated into simplified Chinese and back-translation was conducted.Then 121 decision-making scenarios met the inclusion criteria were selected from a first-class ter-tiary hospital by convenience sampling method and were analyzed.Results All three parts of the MAPPIN′SDM scale demonstrated 3 factors of 15 items by employing exploratory factor analysis （decision-making questions and options, patient participation, information and appointment）, which could explain 62.788%, 59.672% and 60.746% of the total variance. The Cronbach′s alpha coefficient for three parts was 0.814, 0.857 and 0.858 respectively, and the test-retest reliability was 0.914, 0.892 and 0.884. Reactivity analysis showed that the scale could effectively distinguish the difference of common decision-making process between the training group and the untrained group.Conclusion The simplified Chinese version of the MAPPIN′SDM scale is valid and reliable for evaluating the decision-making process of doctors and patients.