This research had aimed to produce science learning materials physics materials based on laboratory inquiry model to improve student’s critical thinking skill in senior high school on chapter work and energy. This research was conducted to implement the teaching and  learning materials based on guided inquiry model. This research developed them using Dick-Carey’s model and try outed using one group pre-test post-test design. The subjects of this research was science learning materials that consist of syllabus, lesson plan, student’s work sheet, instructional media, evaluation sheet to measure critical thinking skill. The learning material been tried out to 15 students’ of X - MIPA 4 class SMA Negeri I Jogoroto in the even semester of  2017/2018 academic year. The data were collected using validation, observation, test, and questionnaire. The data were analyzed  using descriptive quantitative and qualitative technique. The results  showed: (1) The validity of the learning material; (2) The practicality of the learning instrument that can be found from: (a) the implementation of the lesson plans that is categorized as ‘good’, and (b) the constraints occurred during the implementation of the learning process; (3) The effectiveness of the learning instrument that was reviewed through: (a) students critical thinking skills improved with N-gain value 0,72 by high category; (b) students’ highly excellent response towards the instrument and the learning process. Based on the data analysis, it can be concluded that the Science Learning material by using guided inquiry model was feasible to improve student’s critical thinking skill.