The aim of this research is to determine the application of the reading guide strategy in improving students' ability to understanding the content of discourse texts in Indonesian language subjects in class IV of SD Negeri 0119 Banjar Raja. The research used is PTK research, namely classroom action research. The subject of this research is SD Negeri 0119 Banjar Raja and the object of this research is class IV with a total of 21 students. There are two data sources that researchers use, namely primary data sources and secondary data sources. . Primary data sources are data taken directly from the research object, namely class IV students and teachers. This primary data source comes from field data obtained from observations and interviews. Secondary data sources are data taken in the form of documents, such as books, books, dictionaries and other literature related to skills in understanding the content of discourse texts. There are three cycles in the design of this research cycle, namely Pre-Cycle, Cycle I and Cycle II. Based on the results of the research carried out by the author, it can be concluded that the application of the reading guide strategy in improving the ability to understand the content of discourse texts in class IV Indonesian language subjects at SD Negeri 0119 Banjar Raja, Barumun District, Padang Lawas Regency, namely in the pre-cycle only 2 students or 9.52 % who have the category "very good" 4 students or 19.05%, "good", 8 students or 38.10%, "fair", 6 students or 28.57%, "poor", 1 student or 4.76 % "very poor", while students' ability to understand the content of cycle I discourse texts has begun to increase, namely 4 students or 19.05% who have the "very good" category, 6 students or 28.57%, "good", 10 students or 47 .62%, "sufficient", 1 student or 4.76%, "poor", no students "very poor", and students' ability to understand the contents of cycle II discourse texts has increased, namely 11 students or 52.38%, which has a "very good" category, 9 students or 42.86%, in the "good" category, 1 student in the "fair" category, no students in the "Poor" category, no students in the "very poor" category. So it can be concluded that the reading guide strategy can improve the ability to understand the content of discourse texts in class IV Indonesian at SD Negeri 0119 Banjar Raja, Barumun District, Padang Lawas Regency.