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Chemistry learning needs an assessment to evaluate ways of students- thinking. One of them is a critical thinking skill test. The purpose of this study is designing domain-specific critical thinking skill on thermochemistry concept. Content Validity Ratio (CVR) and Confirmatory Factor Analysis (CFA) were evaluated to analysis the validity of the instrument. Cronbach-s Alpha were evaluated to analysis the reliability. Descriptive method was used as a research design. The participants of this study are 185 senior high school students in Cilegon-Banten-Indonesia. Data are obtained from expertise judgment, empirical test, and interview. The results showed that the quality of instruments of domain-specific critical thinking skills on thermochemistry concept based on CVR and CFA is 0,723 (good criteria). Cronbach-s Alpha test showed 0,652 (high criteria). It can be concluded that instrument is feasible to measure students- critical thinking skills on thermochemistry domain knowledge.