The objective of this present research is to study the mistakes in solving geometry problems viewed from the Polya Approach in terms of the understanding and implementation aspects. The subject was the second semester students of Mathematics Education Program, University of Muhammadiyah Malang at the even academic year of 2017-2018. A qualitative approach with the descriptive type involving some students with focus on their results in learning geometry was adopted. An analysis was made by paying attention to the results of the answers of the final test and by making observations during the learning process. The research results showed that mistakes the students made were caused by their improper understanding of the basic implementation adopted in solving problems namely theorems, postulates, and definitions. The mistakes in understanding gave impacts on the implementation in solving problems which are not appropriate with the correct answers to the problems.
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