The financial engineering is vital for the Islamic finance because its survival and development depend on the degree of the innovation and the originality of products offered by the latter. Indeed, the financial engineering can create new crenels, spread the existing market and create business opportunities allowing the Islamic financial institutions to offer more products to a customers, bigger variety provide the market of a multitude of choices. The Islamic finance contrary to what we can believe supplies the basic elements which can be used to build the most complex financial instruments which are going to improve the liquidity and to offer the management tools of risk. In this work, we are going to approach the Islamic financial principles of the engineering, then we are going to move on with the challenges to which is confronted to clarify the process of development of products within the framework of the Islamic finance, we shall base on studies developed in International colloquiums, publications of research, scientific journals and doctoral theses. We find finally that the form, the bottom and the substance of the contracts which should be respected during the structuring of a financial product, as well as the vision restricted of the understanding of the conformity of Chari'ah in the only respect for the legality of the contractual and technical forms must be changed, as well as undid emerge from the bad understanding of maqassid Al-Chari ' Ah, from maslaha and from darourah.
