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In this work, we investigate configuration formation of two inner terrestrialplanets near mean motion resonance (MMRs) induced by the perturbation of adistant gas-giant for the Kepler-68 system, by conducting thousands ofnumerical simulations. The results show that the formation of terrestrialplanets is relevant to the speed of Type I migration, the mass of planets, andthe existence of giant planet. The mass and eccentricity of the giant planetmay play a crucial role in shaping the final configuration of the system. Theinner planet pair can be trapped in 5:3 or 7:4 MMRs if the giant planetrevolves the central star with an eccentric orbit, which is similar to theobserved configuration of Kepler-68. Moreover, we find that the eccentricity ofthe middle planet can be excited to roughly 0.2 if the giant planet is moremassive than 5 $M_J$,otherwise the terrestrial planets are inclined to remainnear-circular orbits. Our study may provide a likely formation scenario for theplanetary systems that harbor several terrestrial planets near MMRs inside andone gas-giant exterior to them.

Near Mean Motion Resonance of Terrestrial Planet Pair Induced by Giant Planet: Application to Kepler-68 System