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This research was aimed to describe students misconception of junior high school students on the concept of the properties of rectangles and alternative to overcome them.This research was qualitative descriptive research using test with the CRI (Certainty of Response Index) method and interview method. There were three students as subjects in this study who was identified had the most misconceptions of all students in the class.Based on the data analysis, the three subjects showed similar misconceptions. The misconceptions occur one of them on the properties of rectangles.  Student’s misconception caused by picture given to problem. The misconceptions may have been due to a lack of understanding of rectangle properties. Alternatives can be done such as re-explain (remediation) or by using cognitive conflict strategies.In particular, our results indicated that 8^th grade students had misconceptions in understanding the properties of rectangles.Knowing the misconceptions students can influence how new knowledge is interpreted and have an impact on student’s ability to learn correct information in the future.

Misconceptions, Rectangles, The Causes of Student Misconception, Alternative to overcome misconception