Since the experimental realization of Bose-Einstein condensates, the dynamics of Bose-Einstein condensates in a double-well potential has attracted extensive attention, and the atomic tunneling and self-trapping have been researched considerably. By using an external driving field or adjusting the atomic interaction by Feshbach resonance, we investigate the tunneling, and the regular and chaotic motions of atomic wave-packet within the mean-field theory. We propose a scheme to control the distribution of at...