Economic objective of Profit maximization, by nature, instigate person's lust for wealth accumulation irrespective of permissible or prohibited means of money making. As a result, a person prefers to make easy money without bearing any troublesome. Interest is easiest way to make money.Therefore, people deals in interest based lending and makes guaranteed profit along with principle amount. Islam prohibits such type of business declarring it riba (interest). However, Islam provides an alternate of it in form of sale and shirkah (partnership). According to shirkah, person can make profit stipulated that he will bear risk of loss on his principle and share loss with his partner. There is no other way to earn profit other than sale and shirkah. In modern Islamic Banking shirkah is being practiced in form of Musharkah. There are many issues regarding conceptual awareness of modern Musharkah, its applications, and newly developed product Diminishing Musharkah. After explaining the shirkah, Diminishing Musharkah is discussed in detail. Finally, this study analyzes and highlights the relative fiqhi issue.