Teaching critical thinking to secondary school has been a concern in the last few decades. Learning using the student-oriented model is expected to be able to move students to think critically and then carry out investigations in learning.The experimental research with one group pretest-posttest design. This research involving 17 students of class XI MIPA 8 at SMA Negeri 2 Mataram as a research sample. Critical thinking ability were measured using 10 essay test items. The test instrument used has been tested for validity and reliability. The data of critical thinking ability were analyzed descriptively and statistically. The results showed that the application of the student-oriented learning model to solving dynamic fluid problems in students was able to improve their critical thinking skills and learning outcomes.