The adsorption characteristics of THM on the activated carbon were studied to remove the THM in the chlorinated drinking water. Batch and column adsorption were conducted to find the limiting step of adsorption, the adsorption rate and breakthrough curve. In the batch adsorption, it was found that chloroform was adsorbed rapidly and the pore diffusion was faster than the surface diffusion. The adsorption rate was linearly increase with the temperature and the reciprocal of particle size. In the column adsorption, the breakthrough curve was more dependent on the activated carbon column length than on the activated carbon particle size.