Nowadays, ones of the biggest challenges that educational institutions face is the explosive growth of educational data. and how to use these data to improve the quality of managerial decisions. Data mining, as an analytical tools that can be used to extract meaningful knowledge from large data sets, can be used to achieve this goal. This paper addresses the applications of Educational Data Mining (EDM) to extract useful information from registration information of student at university of Palestine in Gaza strip. The data include five years period [2005-2011] by providing analytical tool to view and use this information for decision making processes by taking real life example such as grade and GPA for the students. abstract should summarize the content of the paper.