<![CDATA[The purpose of this article study is as an application/implication of the science of System Modeling and Simulation and it is expected to be understood about how to create an Islamic economic system and how to model it mathematically, so that an optimal solution is obtained. The research method uses qualitative and quantitative analysis. From the results of making a mathematical model of the Islamic economic system, an equation is obtained, namely Y = X1 + X2 + X3 + X4. The Islamic economic system is applied using gold and silver currency, prohibiting usury, based on the real economy, and ownership laws covering individuals, the public, and the state. From the modeling of the Islamic economic system, it can be concluded that the cause of the global financial crisis is the implementation of the capitalist system, the non-real economy does not have an impact on the real economy which fosters development in the trade of goods and services, the Islamic system is an alternative solution that turns out to inherit an appropriate, fair, just, humane economic system, to create welfare and welfare of life, not only in the world, but also in the hereafter. The mathematical model of the Islamic economic system obtained Y = X1 + X2 + X3 + X4 = (A + B) + (C + D) + (E + F) + (G + H + I).]]>
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