To date, more than 130 cxtrasolar planets around retain sequence stars are revealed mainly by the Doppler radial velocity measurements. Duc to the obscrvational biases, most of the detected planets are moving in orbits closing to the host stars, with some in highly eccentric orbits. Dynamical processes during the late stage of planet formation are important to account for the present orbital properties. These processes include: planet migrations and rcsonance trappings causcd by gravitational interactions between protostcllar disk and planets, dynamical scattering due to interactions between planets, etc. In this paper, we review the major effects of these dynamical processes on the orbital characteristics of the planet systems.