The study was to preliminarily establish the concept of demanding belief and its scale and examine reliability and validity. Through literature analysis and semi?structured interviews， the concept and theoretical structure of demanding belief and the items pool of the scale were determined. The item analysis， exploratory analysis and confirmatory analysis were done. The demanding belief scale（DBS） contained 16 items and 3 factors， including towards?self， towards?others， towards?world. The result of confirmatory analysis was acceptable. The test?retest reliability for 3?weeks interval was 0.759 and the split?half reliability was 0.831， Cronbach’s α was 0.901. The criterion?related was acceptable， for the correlation coefficient between DBS and the Chinese version of frost multidimensional perfectionism scale（FMPS） was 0.425（P<0.01）. The DBS is a qualified tool for evaluating and predicting mental health for its good psychometric properties.