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This study is design research aimed to design mathematical thinking problems that can be used to measure modelling aspect in topic linear equations with three variables. Mathematical Thinking aspect modelling consist of 4 indicators, which are: concretization, objectification, mathematical sense-making, and estimation of results. The subjects of this study were 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 result of this study, for questions number 1, student 1 showed the appearance of 3 indicators (concretization, objectification, mathematical sense making), students 2 cannot answer the question, and student 3 showed the appearance of 2 indicators (objectification, mathematical sense making). For question number 2, student 1 showed the appearance of 2 indicators (objectification, mathematical sense making), student 2 showed the appearance of 3 indicators (concretization, objectification, mathematical sense making) and student 3 cannot answer the question. For question number 3, only student 2 answer the question showed the appearance of 3 indicators (concretization, objectification, mathematical sense making). Based on this result, the conclusion is the problems stills needs to revision.