Critical thinking is widely used in the field of Library and Information Science, regarded as the core training objective of information literacy education and the explanatory or moderator variable of information behavior research. In measuring this variable, researchers often use the California Critical Thinking Disposition Inventory (CCTDI) and the corresponding Chinese version (CTDI-CV). However, there are many problems in this version, such as no structural validity test, unstable factor structure, and too many items (more than 70). The purpose of this study is to investigate the feasibility of simplifying the existing scale, and to explore a simplified critical thinking scale for LIS research and practice. Based on the data of 383 valid samples, this study carried out project analysis, factor analysis, reliability test and other research processes. The simplified scale consists of six dimensions and 28 items. The KMO is 0.820, and the explanation rate is 50.208%. The overall alpha is 0.90, and subscale alphas range between 0.45 and 0.78. Compared with other scales, the result of this study maintains the level of reliability, factor structure and explanatory power. The test of structure validity is carried out, and the number of questions is reduced.