In present study, the entropy analysis for laminar MHD flow over a stretching sheet with variable heat flux in presence of heat source and constant suction is done. The flow is influenced by uniform transverse magnetic field. The PDE governing differential equations including continuity, momentum, and energy are reduced to ODE ones by similarity solution. Then, the ODEs are solved by applying the 4th-order Runge-Kutta method. To validate, the result of this study and the published result are compared and the agreement is achieved. Bejan number is used as a design criterion parameter for a qualitative study about the cooling. The effects of suction parameter, heat source parameter, magnetic parameter, Prandtl number and heat flux parameter on dimensionless velocity and temperature, dimensionless entropy generation and Bejan number are shown in several plots. The results show that with increasing Prandtl number, suction, heat source parameter, magnetic parameters and parameters related to heat flux, the Bejan number is decreased, decreased, increased, decreased and decreased, respectively. The results of this research can be used for the increasing of the cooling in the surface in the coating.