The increasing of population needs safe, reliable and consistent supply of water had made many manufacturing industries and water treatment plants to look for efficient desalination plants.There are two major types of desalination technologies around the world, namely membrane desalination and thermal desalination . MEE is one of the types of thermal desalination. MED process operates in a series of evaporator condenser vessels called effects and uses the principle of reducing the ambient pressurein  the  various  effects. A novel algorithm to solve the steady state analysis problem of three effects feed forward multi effect evaporator (FF MEE) for water desalination is investigated. A dynamic model is derived for MEE. FF MEE dynamic model is controlled using a Proportional-Integral (PI) controller that designed to improve its performance against the variation of the cold water temperature. Simulation results show the effectiveness of the proposed design and calculation has been presented using MATLAB^®.