Realistic Mathematics Education (RME) is an instructional theory that has been implemented in many countries around the world to link mathematics to real-world situations. The effectiveness of implementing RME in mathematics education is highly dependent on the role of teachers. This study was conducted with 64 high school teachers to survey their understanding and perspectives on RME and the status of RME implementation in teaching the topics of ellipse equation. Through qualitative analyzing the survey results, the study found that teachers are interested in RME, although the percentage of teachers formally trained in this theory was not high. Besides, the survey shows that it is necessary to help teachers overcome difficulties and improve the frequency and effectiveness of RME application in teaching mathematics.