Studying the scientific procedures of the muslim schalars who have written about reorophetic biography , is considered one of the important issues in scientific research. For , it givesfor the researcher and the studiers the ability to understand the style which that scholar or the historian has followed in writing the prophetic biography. Among the most prominent scholars is Ibn Isihaq who has preserved for us the prophetic biography in his book Biography of the Invasions.
This study comes to shed light on his procedure in writing the prophetic biography.