As an ideal for self-determined behavior, intrinsic motivation is considered to be more powerful than extrinsic motivation in the success of learning a language. The matching students’ preferred reading materials and instructional strategies would lead to increased motivation and probably improve reading performance. That is why the researcher conducted this study. Because the research will lead the Thai students’ motivation in learning English reading text. Based on the case above, this research was conducted at finding the Thai students’ motivation and the factors toward learning English reading text. This research used qualitative research which is analyzed by descriptive design. The sample of this research was 25 Thai students at UIN Walisongo Semarang. After gathering the data, the researcher was analyzed all of the data by using the formula proposed by Sugiyono. The result of this research revealed that there were 3 highest of students’ motivation, they are: 8.30% for reading efficacy, 7.89% for reading challenge, and 8.07% for reading work avoidance. From the result, the factors of Thai students’ motivation were physical condition, teacher, and success. These factors make them interesting in doing reading an English text. Based on the data, the motivation which relate to the extrinsic motivations are: reading efficacy, competition in reading, reading challenge, and reading work avoidance. While, the intrinsic motivations are: reading curiosity, reading involvement, importance of reading, reading for grades, social reasons for reading, and compliance.