Microlearning, as an informal learning approach, has gained increasing popularity in both the training industry and professional studies disciplines over the last several years. However, despite the rising interest in microlearning, how to design microlearning activities and what microcontent is reasonable for microlearning activities have rarely been addressed. In this study, we designed a 6-week micro-reading activity. During the process, 30 students majoring in Education Technology participated in the activity. They were randomly divided into an electronic book reading (e-reading) group and a paper book reading (p-reading) group, and were required to read the same book within 6 weeks. Formative and summative evaluations were performed to assess the effectiveness of the micro-reading activity. Descriptive statistics and bar and line chart were applied to reflect the results of formative evaluation; One-way ANOVA analysis was used to process the data of summative evaluations. Students' average reading time, reading pace, and weekly reading notes were recorded and analyzed as the formative evaluation. The results indicated that all students achieved the reading objective, and they kept relatively high engagement in the micro-reading activity. According to the results of the summative evaluation, both groups of students' average scores were relatively high. However, compared to the p-reading group, the average score of the e-reading group was higher, and some significant differences were also found in the average scores of the two groups. Therefore, the 6-week micro-reading activity was beneficial for students' reading effectiveness, and the e-reading type was more effective for promoting students' reading effectiveness. In the future, it would be worthwhile for designers to consider how to design the duration of activities in a reasonable way and to compare how new electronic reading platforms compare with traditional print sources.