To study the isomerization of normal hexane on SZ and Pt/SZ catalysis in a batch reactor. The variables in this research were temperature in the range of 210-330 ํC, initial hydrogen pressure from 1-5 MPa, reaction time from 120-360 min and weight ratio of catalyst to reactant from 0.25 to 1.00 g. The products were analyzed by gas chromatography. The experimental results found that percent selectivity of desired products (2,2-dimethylbutane and 2,3-dimethylbutane) increased with increasing temperature hydrogen pressure and weight ratio of catalyst. However increasing of reaction time was found to decreased percent selectivity of desired products. The optimum conditions for isomerization of normal hexane were weight ratio of Pt/SZ catalyst 1.00 g per normal hexane 10 ml at 330 ํC, 5 MPa and reaction time of 120 min. The percent selectivity of 2,2-dimethylbutane and 2,3-dimethylbutane were 22.72% and 8.45%, respectively.