Good learning outcomes supported by a goodrnunderstanding of concepts. A good understanding of the concept is an understandingrnthat do not contain misconceptions.rnThis study aims to identify the misconceptions of prospective mathematics teacher onrngraphing function. This research was conducted on 8 undergraduate students. Thisrnstudy used a descriptive research design. Descriptive research is used to analysernconceptual understanding and student misconceptions based on test results usingrndiagnostic test instruments and interview results. The questions used were 5 questionsrnthat had been validated by 2 mathematics lecturers with valid results. The resultsrnshowed that most of the students were still doing plotting without identify of therndomain dan characteristics of the function.rnSome of them were also still stuck with using integers as the reference.