There is a shortage of the drinking water as well as power in worldwide due to increased in population and its necessity. Solar thermal power plant and Multi Stage Flashing (MSF) system helps to overcome the need of both power and desalinated water. This paper addresses the demand of the power and drinking water. The integration of power and desalination system is the main objective which will give two products as output by using solar energy. The modified Rankine cycle produces desalinated water by condensing the saturated steam at the exit of the turbine or by adding turbine at the exit of the flashing system produces the power and vice versa. The theoretical analysis is made for proposed system and it is suggested for placing the turbine at the exit of flashing system in the high temperature MSF. The proposed model is analyzed in solar thermal single stage flashing system producing 1000 LPD desalinated water. It results 9.33 kW of power at the flashing temperature of 160°C and the turbine inlet pressure and temperature are 5.92 bar and 170°, respectively. The high pressure on the flashing chamber avoids vacuum is the advantage in the proposed system. This proposed is used for low heat recovery and for producing both power and desalination system. © 2006-2015 Asian Research Publishing Network (ARPN).