Algebra is a part of mathematics that plays an important role in solving problems in mathematics and other scientific fields, starting from concepts to algebraic thinking. Therefore, students need to master algebraic thinking skills. To meet that requirement, teachers are the ones who carry out the noble mission of discovering and developing algebraic thinking for students in the most reasonable way. This study was conducted to contribute to the foundation for further studies on the development of algebraic thinking for 10th-grade students. The survey results of 50 high school teachers provide an overview of teachers' perceptions in teaching the topic of functions, graphs and applications and the student's difficulties. According to the research results, most teachers have identified most of the difficulties that students face, but the development of algebraic thinking for students is still limited;having a more comprehensive view of the problem is necessary