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Effects of the magnetohydrodynamics flow control on Earth reentry flight characteristics are examined by a coupled numerical analysis of the reentry flight trajectory and the magnetohydrodynamics flows with thermochemical reactions. Initial flight altitude and velocity of a blunt body with a nose radius of 1.35 m are 75.3 km and 7.2 km/s, respectively. Numerical results show that at high altitudes such as about 75 km, the main factor of the mitigation of wall heat flux by the magnetohydrodynamics flow control is the increase of the thickness of the shock layer by applying the magnetic field. At low altitudes such as about 55 km, on the other hand, the main factor of its mitigation is the decrease of flight velocity due to the change of flight trajectory by applying the magnetic field. It can also be found from a rough estimation that about 75 % of its mitigation amount at the altitude of about 60 km, where the aerodynamic heating is severest, is attributed to the decrease of flight velocity by applying the magnetic field. [ABSTRACT FROM AUTHOR]