The purpose of this study was to effectively design a postgraduate-level educational statistics course by understanding the relationship among learners´ motivation, attitude changed, and achievement. By constructing an action research, the researcher who was also the instructor of the educational statistics class, aimed to foster a positive learning environment where that students´ positive learning motivation will cause good achievement. Using this strategy, the researcher invited all nine postgraduate students who elected the statistics in education course to participate in the study. The research tools included ”The Scale of learning attitude and feeling” and 'Concept associative analysis table' which were designed by the researcher. In conclusions, the study reported that educational statistics was really a challenging learning subject. Meanwhile, the students´ learning attitude and feeling were the most important contributing factors. In fact, about the study found out that postgraduate students' fear of educational statistics was the most critical learning psychology obstacle. Besides, other than the concept associative analysis table, students who have taken any educational statistics course in the past obtain more course objectives than those who have never learned this course.