This study aims to improve the quality of the process and student learning outcomes, especially the ability to understand and write negotiating texts of the students of SMA Negeri 1 Galur Kulon Progo through genre-based learning models. This study is a classroom action research (CAR) which was conducted in two cycles. The research was conducted at SMA Negeri 1 Galur Kulon Progo through four stages, namely; planning, implementation, observation, and reflection on actions in each cycle. The research subjects were grade X D students of SMA 1 Galur Kulon Progo in the academic year 2017/2018. The data were obtained from the learning process, the ability to understand the negotiating text, and the students' ability to write negotiating text, and the ability to write student negotiating texts. The data collection was through observation and tests, using the instruments including observation sheet and test questions. The data quantitative and qualitative in nature. The quantitative data were the test results of the test in comprehending and writing negotiating texts. The qualitative data were obtained from the results of observations in the field. The data analysis techniques used were the qualitative descriptive analysis techniques. The qquantitative data were analyzed using descriptive statistical techniques from the excell program. The qqualitative data were analyzed using inductive analysis techniques with steps including organization, description, and interpretation of data. The results of this study indicate that with genre-based teaching models could improve three things. First, it improved the learning process. The results of the action in cycle 1 showed that active participation of students in learning was 70% and in cycle 2 it improved to 90%. Second, it improved the ability to understand the negotiating text. In cycle 1, the percentage of achievement in completing the test ability to understand the negotiating text was 65% and in cycle 2 it was 85%. Third, it improved the ability to write negotiating texts. In the first cycle the percentage of achievement in completing the test of negotiating text writing skills was 70% and in the second cycle was 90%.