Grade exerts an imperative role in students lives, and becomes more and more important in encourating students to learn and study. So I am not all inclined to the topic in that high grade can urge students to have an incentive to do well in whole aspects of his lives, but if a students fail a exam or did not pass it, the grade will produce counterproductive influence on the students' physical or metal ability, that is it frustrates impetus or bring negative impact such as the abandonment of his studying, addict in the drug and alcohol.One contribution of higher grades is making students aware of the importance of studying to the achievement of his effort. Thus, he will put all his heart and passion into it, and gradually the pleasure and enjoyment he possesses from his painstaking is very remakably. For example, my friends, Victor, often makes greater marks in every exam which makes me extraordinary confused. One day, the reason he gave to me is that a good marks symbolize one kind of confidence and competence that stimulate him to work harder and pay more enthusiasm into it. At the same time, the painstaking work also make him have an idea that his effort will be paid off. So a better grade might encourage students.A good marks can not only encourage students but also bring fame and foutune to the future lives of students. A survey of students who acquire wealth and reputation after graduating from unversity for four years, dramatically illustates the importance of a higher grades. About 90% students indicate that when they were studying college or university, they would get relatively better grades many times in many exams. Thus, when they sent their performance to the most desired companies that always enrolled them. On the basis of their striking grades, the advancement for them was very grasped than students who had a low grades.However, if a students spare no effots in his study, the marks he got from the exams is  very undesired and the low grades will discourage his confidence and bring more setbacks and frustration to him. As it did in the case of my classmate, John, is a hardworking people but the product is always negative and undeserved. Many teachers and his parents hold the belief that he is a play-centered boy and often belittle him. little by little, he lost the incentive and impetus in his study and spent more time on computer game which can gain pride. Therefore, only good marks would encourage students.In sum, from all the reasons explained above, I can  draw safely a conclusion that higher grades will stimutate students to work hard and low grades would create negative influence on people in most cases.