The purpose of this study is to represent and analyze a function of GSP, students\' thought processes and attitude toward mathematic, etc. in detail in the geometric learning used with dynamic software GSP. And it is to examine the possibility whether widely used computer can be usefully used in students\' understanding of mathematic or not. As a result of this study, the computer software in the geometric learning can affect various things: discovery of the figure property through visualization, visual confirmation about reasoning, generalization of the figure property discovered in a case and understanding of proof through construction processes. And using the computer in the mathematic can stimulate the students\' curiosity and induce their interest, and it can induce affirmative and active learning attitude. In the geometric learning, the students made a lot of errors. This study gives us educational suggestion that if we are going to do explore learning by using the dynamic software GSP in the geometric learning, it can make students\' achievement in their learning raise by the interest in learning and the mitigation of difficulties.