This is a research about the geometric misconception and difficulties for the eighth grade students in junior high school. Through action research, teachers can recognize the misconception that students will encounter; thus, teachers give guidance to students at the appropriate time. By this way, we can increase the learning motivation of students and cultivate their abilities to solve geometric problems by themselves. Also, teachers can make their professional knowledge much more mature. From the conclusion of this research, the following suggestions are for teachers while they are guiding pupils to solve geometric problems: 1.Culivate students' abilities to analyze geometric questions. 2.Clarify the misconception of students. 3.The feedback of students.