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This study aims to describe about problems that measured students- mathematical thinking aspect reasoning in topic relation and function. The subjects in this study were three students in grade 8 who were taken randomly. There are three problem-solving questions used in this study. The study is design research with the focus is mathematical thinking aspects reasoning. The research methods of this study consist preliminary design, focus group discussion (FGD), trials, observations and interview, and retrospective analysis. The indicators of measuring mathematical thinking aspect reasoning are deductive, inductive, and logical analysis. Based on the indicators, then from the 3 questions given, the students were able to do inductively in question number 1 and the conclusion is correct. Whereas in question number 2, students are not able to solve the questions well so there is no indicator of reasoning appears. Meanwhile for question number 3, indicators of deductive reasoning and logical analysis appears, but students still have difficulty in drawing the right conclusions.