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Exoplanets discovered over the last decades have provided a new sample ofgiant exoplanets, hot Jupiters. For lack of enough materials in currentlocations of hot Jupiters, they are perceived to form outside snowline. Then,migrate to the locations observed through interactions with gas disks orhigh-eccentricity mechanisms. We examined the efficiencies of differenthigh-eccentricity mechanisms to form hot Jupiters in near coplaner multi-planetsystems. These mechanisms include planet-planet scattering, Kozai-Lidovmechanism, coplanar high-eccentricity migration, secular chaos, as well asother two new mechanisms we find in this work, which can produce hot Jupiterswith high inclinations even retrograde. We find Kozai-Lidov mechanism plays themost important role in producing hot Jupiters among these mechanisms. Secularchaos is not the usual channel for the formation of hot Jupiters due to thelack of angular momentum deficit within 10^7 Tin (periods of the inner orbit).According to comparisons between the observations and simulations, we speculatethat there are at least two populations of hot Jupiters. One populationmigrates into the boundary of tidal effects due to interactions with gas disk,such as ups And b, WASP-47 b and HIP 14810 b. These systems usually have atleast two planets with lower eccentricities, and keep dynamical stable incompact orbital configurations. Another population forms throughhigh-eccentricity mechanisms after the excitation of eccentricity due todynamical instability. This kind of hot Jupiters usually has Jupiterlikecompanions in distant orbits with moderate or high eccentricities.

Forming Different Planetary Architectures . I . Formation Efficiency of Hot Jupites from High-eccentricity Mechanisms