Objective To develop a scale assessing ICU patients′ satisfaction towards humanistic care and test its reliability and validity, so as to provide a reference for evaluating ICU humanistic care satisfaction accurately and objectively.Methods Based on Watson′s Caring Theory, the dimensions and items of the scale were formed through literature analysis and qualitative interviews.The item analysis and the reliability and validity tests of the scale were conducted via expert consultations, a pilot study of 135 ICU patients, and a formal survey of 309 ICU patients.Results A total of 6 factors were extracted via exploratory factor analysis, and the cumulative variance explanation rate was 66.009%.The S-CVI of the scale was 0.975.The final scale included 29 items categorizing into 6 dimensions:active introduction and understanding of needs, communication and decision making, respect and privacy protection, comfort care, care and support, transfer and follow-up.The Cronbach′s α coefficient of the scale was 0.922, the split-half reliability was 0.857, and its test-retest reliability was 0.734.Conclusion The Humanistic Care Satisfaction Scale for ICU Patients has good reliability and validity, and it can be used to evaluate the humanistic care satisfaction of ICU patients.