Parties and Islamist movements or that of Islamic roots a great interest by researchers for its varied theories and aims, and Morocco was not away from these Parties and movements. The arena of Politics in Morocco included a considerable number of these Parties, nevertheless most of them are not very old. This study is a trying to shed light on one of these Parties; Justice and Development Party which was established in 1997. It is an example of the moderate Islamist Parties that possess an integral program, plain goals and a mature understanding for the Arabic state of affaires that will have a positive impact in case of assuming power.