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Abstract. Reflective thinking ability plays an important role in supporting mathematical problem solving skills. One topic in mathematics is sequence and series. This study aims to describe the results of the analysis of reflective thinking ability of students on topic arithmetic sequence and series, using descriptive research methods. To answer the research question, we gave a written test to 30 grade XI students in one of senior high schools in Lampung. Then, we conducted interviews with students in the upper, middle and lower groups, each with 3 students. The results showed that the average level of reflective thinking ability of students was quite adequate. The analysis of this study can be used as a consideration in developing learning designs to support students reflective thinking ability.