We have polarized protons in naphthalene doped with pentacene at higher temperature (≥77 K) and lower magnetic field (∼3 kG) than those for ordinary polarized proton targets. Pentacene molecules have been excited with a laser beam. Protons in naphthalene have been polarized dynamically on the intermediate state of pentacene. We obtain about 13% polarization at liquid nitrogen temperature in about 3kG with a N2‐laser of about 150 mW. It has been found to be also possible to obtain high polarization at room temperature.