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Attempt has been made to analyze aerodynamics of Martian entry vehicles for hypersonic rarefied conditions by simulating flows around such like Mars Science Laboratory. The effects of real gas model on hypersonic rarefied aerodynamics are investigated. Solutions of entry capsule aerodynamic characteristics are obtained and presented. The results show that as flight altitude increases, rarefaction enhances, shock standoff distance and shock thickness increases. At the same time, shock intensity weakens, and flow contours are trend to arc shape. Real gas effect results in that compression enhances in windward and expansion also does in leeward. At the same time, axial force coefficient, normal force coefficient and pitch moment coefficient increase. On the other hand, as rarefaction enhances, axial force coefficient, normal force and pitch moment coefficients also increases. At the same angle, pressure center moves forward and static stability is decreased as flight altitude increases.