The Mosque of Imam Ali (a) or (the large mosque of Basra ) is the second mosque built in Islam after the Prophet's Mosque, and the first mosque built in Iraq about 14 AH after opening Al-Madina by the leader Utbaa bin Ghazwan, and it remained a historical monument to impact and known as Imam Ali (AS) step mosque of Imam Ali (a) .The reason for this is due to the visit of Imam Ali (AS) and pray in it during his caliphate in 36. And the mosque is gaining a religious importance for Muslims where they means in some religious occasions.