This study aims to determine and explain the effectiveness of the teacher's book and the use of the teacher's book on the material of hobbies that become achievements. In addition, this study aims to determine the obstacles to the effectiveness of using teacher books and to find out solutions or strategies to improve the use of Indonesian language teacher books on hobbies that become achievements. This type of research uses a qualitative descriptive approach. The instruments used were interviews, observation, and documentation. Data analysis uses the Miles and Hubberman model through three stages, data condensation, data display, and conclusion drawing or verification. The results showed that the effectiveness of the Indonesian language teacher's book was very good in communicative aspects, clear learning objectives, adequate material, and learning strategies according to student needs. This is supported by teachers who are professional in teaching. However, the effectiveness of using teacher books still experiences obstacles or challenges. This is due to the fact that the teacher's book and student book facilities are still uneven and the material in the teacher's book is still lacking. These obstacles become obstacles so that solutions or strategies are needed. Solutions or strategies that are applied need support from schools, education offices and the government in checking the distribution of teacher books and student books. MGMP should also often conduct training related to teachers' books either through workshops, panel discussions, or workshops.