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This study is design research aimed to describe about problem-solving question that can be used to measure mathematical thinking aspect mathematization in topic trigonometry. Mathematical thinking aspect mathematization has 4 indicators: formalization, connecting, geometrization, and optimization. The subjects of this study are three senior high school students in grade 10 and 11. The process of this study consists of five stages, namely: preliminary design, focus group discussions (FGD), trials, observation and interview, and retrospective analysis. The technique for data analysis was qualitative. As the results of this study, for question number 1, all of student-s answer was correct, student 1 and 2 showed appearance of formalization and optimization, student 3 showed appearance of formalization, geometrization, and optimization. For question number 2, all of student-s answer was not correct, student 1 and 2 showed appearance of formalization, and optimization, student 3 showed appearance of formalization, geometrization, and optimization. For question number 3, all of student-s answer was incorrect, but from mathematization aspect student 1 showed appearance of formalization and optimization, student 2 and 3 showed appearance of formalization, geometrization, and optimization. All of student showed appearance of formalization, geometrization, and optimization.