The study was to construct a theory of catastrophic belief and establish a catastrophe belief scale. The concept of catastrophic belief was defined and the entries and structures of the scales were designed, based on lots of literatures and semi?structured interviews. The reliability and validity were examined by project analysis, exploratory factor analysis, and confirmatory factor analysis. The catastrophic belief evaluation form consists of 19 items, which are composed of four groups factors: self?evaluation, physical safety, evaluation from others, and property security. The confirmatory factor analysis indicators were：χ2/df=2.238、CFI=0.925、NFI=0.874、GFI=0.894、TLI=0.904、IFI=0.926、RMSEA=0.071, and the internal consistency reliability of the scale was 0.766~0.898, the split?half reliability is 0.893, and the test?retest reliability after three weeks is 0.870. The conclusion is that our catastrophic belief evaluation form has good psychometric properties and can be used as a tool for mental health assessment and prediction.