Financial transactions are one of the main pillars of the Islamic economy. They are closely linked to the industrial, agricultural and commercial activities of the societies in the world through their need for barter and trade, and the need of the state for new financial means. And it is safer than the usual money of gold dinars and silver dirhams for the difficulty of transporting them far away because of the danger of thieves' ways, resorted to the use of instrument and the sealant and banking in financial transactions, and to facilitate and facilitate trade between the cities and territories of the Abbasid caliphate. From this point of view, the title of the research was entitled "Means of financial transactions in the Abbasid state in 3/9/9 AD (instrument, secrecy and banking model) to show the role of these means in securing the financial transactions of the people in order to keep their money from danger. The third topic dealt with the sufajah. The third topic was devoted to banking and its role in facilitating the commercial operations between the different cities and regions of the Abbasid state. The conclusion included the main findings of the research.