Ion pairing and ion induction to solvent play an important role in the protein folding and chemical reactions in the water solutions. The existence of ions has a negligible disturbance to the hydrogen bond structures and rotational mobility of water beyond the first ion solvation shells in the NaCl solutions. The clustering level of ions is sensitive to the force field used in the simulations. The formation of NaCl ion pair in the dilute solution is driven by the entropy increment of water