Abstract:  Even  Abbasid  authority  in  Baghdad  starts  weakening,  then  came  the time  of  disintegration.  At  the  time  of  the  disintegration  of  this  came  some  little dynasty in its own right and broke away from the authority of the Abbasid Even in Baghdad. Among the small dynasties that separates it is the Fatimid dynasty, Fatimid Dynasty arises in North Africa at the end of the third century CE under the  leadership  of  Ubayd  Allah  Al-Mahdi  Shiite  Sect  that  has  Ismailiah.  They recognized as a descendant of  the Prophet through Ali and further through the lineage  Fathimah  Ishmael  the  son  of  Ja'far  Al-Sidiq.  Darul  ilmi  is  a  library founded  by  Harun  Al-Rashid  who  was  the  biggest  library  in  it  also  provided  a place  of  learning  spaces.  Fatimid  dynasty  inidi  the  library  has  a  role  that  is  not small compared to the mosque in the spread of Shia creed Ismailism in society. in  the  month  of  jumadil  end  of  395  Ah/1005  M,  on  the  advice  of  the  Prime Minister  Jacob  Ibn  Killis,  Caliph  al-hakim  founded  the  Jamiah  ilmiyah  form Academy  (Research  Institute)  like  the  other  Academies  are  there  in  bangdad, Bimaristan has a form of architecture is very unique and spacious, with running water  under  the  floor-the  floor.  The  flowing  water  serves  to  cool  the  room  and simultaneously  gives  freshness.  So  give  peace  of  mind  to  patients.  Then,  the bimaristan  already  equipped  with  pharmacies,  drugs  are  referred  to  with  the term "Syarabikhanah" and is headed by a Chief Pharmacist named Sheik. While head of the bimaristan was known by the term "Sa'ur". In every room there are heads of section which carries some according to their respective fields.