The present article is in response to this question that “Whether there is a relationship between biorhythm and educational performance of students?” Population of this study were students of Islamic Azad University, Science and Research Branch and the sample was the OB class in master of public administration which included 28 students , 14 female students and 14 male. During the course, 14 exams have been taken and because of absence some students in some sessions, all in all we collected 341 valid data. In this study, the biorhythm of students have been measured and registered in Easy-Bio software and educational performance by take regular weekly exams in second semester 2010-2011. This study based on the empirical research method in real environment and using the two techniques, qualitative (content analysis) and quantitative (comparison and correlation) have been analyzed and resulted. The collected data was analyzed using SPSS software and Pearson`s correlation and multiple regression, also used compare means and other helpful tests. The results of the research in content analysis indicated that there is a relationship between Physical, Intellectual and Intuitive cycles and educational performance, although quantitative method didn’t prove any relationship between them. Even, quantitative methods are more important because they are suitable to extent the result of the search, but qualitative methods are more suitable for correct usage, especially in the field of human resource.