Abstract.  Self generated high order magnetic field in the corona of Inertial Confinement Fusion Plasma plays a very important role in the design of fusion target because of its strong influence on the transport of thermal flux from the critical density region to the ablation layer. A theoretical study of the generation of megagauss magnetic field study has been presented. Out of number of causes, in this paper we have studied the role of pressure and temperatures gradient inside the fuel pellet to estimate the magnitude of the magnetic field produced. The intense pressure and temperature gradients inside the plasma caused by the lasers intensity (I > 10¹⁹ Wcm^-2) short pulse (t ~ 1 ps) giving rise to the Magnetic field.