The present study aims to identify the relationship between the five-factor model of personality and its relationship to cognitive style (rush and prudence) and academic achievement among a sample of students. The study is based on descriptive approach for studying the relationship between the variables of the study, results and analysis. The study sample consisted of (310) students at Najran University, the research instruments include the five major factors of personality (prepared by the researchers), scale of cognitive rush and prudence (prepared by the researchers). Data will be statistically processed using SPSS through calculating means, standard deviations, coefficient correlations, "T values", multiple regression and analysis of variance. The study resulted that there is a correlation coefficient between the five major personality factors, cognitive style (rush/prudence) and academic achievement. The results also showed that there are statistically significant differences for the level of the five major personality factors between the impulsive and the prudent, and the level of academic achievement between male and female students.