Learning media an important role in supporting the learning process as a tool for students to gain mastery of the material. This study aims to produce valid fluidmistar media and analyze the increase in students' creative thinking skill after using fluidmistar learning media. Research and development is a method specifically using the ADDIE development model. The data collection technique used was a test of creative thinking skills and a student response questionnaire. The results of the expert's assessment stated that fluidmistar media was feasible to use improve creative thinking skills through inquiry learning. The implementation of fluidmistar media in inquiry learning was applied to students of senior high school in Sragen, Central Java with a total sample of 58 students. Student responses to the Fluidmistar learning media obtained good category. The results of students' positive responses indicate that the developed media to improve students' creative thinking skill and positive responses. The increase in creative thinking skill can be seen based on the pretest and posttest score tested through the N-gain test obtained at 0.74 in the high category. Fluidmistar learning media is suitable for use in inquiry learning to improve students' creative thinking skills on dynamic fluid material.