This article discusses the roles of kiai muda in offering the model of typical As'adiyah Islamic Boarding School and disseminating Islam to the Eastern part of Indonesia. Kiai muda are the descendants of ulama graduating from Ma'had Aly at Pesantren As'adiyah. The study aims to answer some fundamental queations as to what As'adiyah Islamic model and the process of Islamization conducted by kiai muda from As'adiyah. The results show that As'adiyah grounds itself on Ahlu Sunna wal Jama'ah school of thoughts that is brought by Imam Nawawi and other the proponents of Shafi'I school of thought. The orientation of Ahlu Sunna wal Jama'ah and the typical Shafi'i mazhab are well maintained and practiced both in the pesantren and the surroundin...