Activated carbons were prepared from palm chars by steam activation. The effect of the activation temperature and time, steam concentration and flux on the n -butane adsorption properties were investigated on the basis of surface area, pore analysis and n-butane adsorption. The amount of n -butane adsorption increased with steam concentration and steam flux at higher activation temperature to the $900^{circ}C$, however this tendancy on the activated carbons were not observed at the temperature above $900^{circ}C$, It was shown that surface area was 978 $ extrm{m}^2$/g, average pore size was 9.3 $AA$ and n-butane adsorption was 5.9 g /100ml in the activated carbons, prepared at $900^{circ}C$, 185 minutes.