The purpose of this study is to investigate the application of Grice's maxims in the essay writing for eight graders. The theoretical framework of this research is Grice’s Cooperative Principle and its maxims including Quantity, Quality, Relation and Manner. In this research, Grice's maxims, their applications and the effects are studied on the student's essays. In addition, the frequency order of the maxims is highlighted in the writings of students. This study is conducted through field method.The main question is how much Grice's Maxims are used in the writings and how they help creating a text. The researchers have analyzed 121 compositions of the eighth graders and extracted the effective factors on the observation of Quality, Quantity, Relation and Manner Maxims and then presented descriptive statistics. The research findings show that Grice's maxims can be used to improve writing skills. Students can keep these maxims in their minds as a framework and use them in their writings. Descriptive statistics of this study indicates that the students of this grade applied the Quantity maxim by 30%, the Quality maxim by 18%, the Relation maxim by 83% and the Manner maxim by 18%. Furthermore, we can see that the maxims overlap each other. Applying and not applying one maxim affects other maxims. The frequency order of these maxims in the writings of students, from most to least, is as follows: Relation maxim, Quantity maxim, Quality maxim and Manner maxim.