The research aimed at implementing the 5E learning cycle model-based inquiry to improve students’ learning achievements on static fluid. This study used a pre-experimental research method promoting one group pre-test and post-test design. The samples were 30 students from a senior high school, using a purposive sampling technique. The data were collected by measuring the cognitive using essays, measuring for affective by using the Likert scale, and by using observation for psychometrics. The results showed that the means for teachers’ and students’ activities were 91% and 87%, respectively, which were classified as really good categories. The increase in the students’ learning achievements was shown for cognitive with n-gain of 0.41 (medium category), for cognitive: 76% (good category), and psycho-motor: 71% (good category). The study used the statistical t-test: Paired Two Sample for Means with tcount > ttable (15.529 > 2.042). Thus, the study concluded that the 5E learning cycle model-based inquiry can be used as an alternative choice to improve students’ learning achievements on static fluid.