It is important for pre-service teacher students majoring in English language to elevate their reading skill for their professional development. Reading logs is one of the reading comprehension tools to empower their reading ability. This case study research objectives were to inspect the effects of using reading logs to develop undergraduate students' reading comprehension abilities, and to study the students' opinion level toward using reading logs to develop their reading comprehension abilities. The purposive sampling technique was used in selecting sixty-five, 3rd year English major students studying in the second semester of the 2022 academic year, faculty of Education, Lampang Rajabhat University. The research tools included a 20-hour lesson plan, a 45-item pretest and posttest, and a 10-item questionnaire focusing on students' opinion toward learning activities. The research revealed that the students' posttest scores were higher than their pretest scores with the statistical significance at the level of 0.5. The students' agreement level also showed that using reading logs helps developing their reading ability at the high level (x ̅ = 4.31). The results lead to the conclusion that using reading logs in reading activity promotes students' reading comprehension ability.