Suleiman the Magnificent’s period was the era when the Ottoman Law system was on the rise as it is in other fields. The reputation “Kanunî”, “Lawmaker” can be explained by the changes that took place in Ottoman law system during his period. This study, which was prepared based on archival documents such as “Mühimme Records” written during the period, differs with the preparation of the jurist and looking the legal developments totally in the period. The results of the study are as follows: The reputation “Kanunî”, Lawmaker stems from the fact that he designed the law system to be more systematic, more clear and to contain balance-control mechanisms. The legal arguments that carried out during the tiem of Sultan Süleiman, who was brave to create “Örfi” law, are still being discussed. Sultan Suleiman, who issued two hundred “kanunname”, law, selected all the “askeri”, executives except the “ilmiye” class from the “kul” system . He closed the gap for the not joining “Divan-ı Humayun” with “kasr-I adl” system. During his time, very serious works of şeria law came out and famous lawyers were trained. From the experience of Suleiman the Magnificent, it can be said that the success of the law could be explained by a over-all approach to law, including education of law, legislating and carrying out a rule.