The cross sections of 131Sb and 131gTe produced from the 238U(n,f) reaction around the neutron energy of 14 MeV were measured by using γ-ray spectrometry with a low background HPGe detector. During the irradiating time, the neutron flux of T(d,n)4He reaction was monitored by following the α-particle. The cross-section ratio of 90Zr(n,2n)89Zr to 93Nb(n,2n)92mNb reaction was used in the determination of neutron energy varied with the emission angle. In the process of calculating results, the Al was used as monitor to eliminate the influence of neutron flux. The obtained fission cross-sections at the neutron energies of 14.1 ± 0.3, 14.5 ± 0.3, and 14.7 ± 0.3 MeV are 31.11 ± 1.72, 29.63 ± 1.80, and 25.56 ± 1.71mb for 238U(n,f)131Sb reaction and 21.82 ± 1.05, 20.40 ± 1.07, and 17.05 ± 0.98 mb for 238U(n,f)131gTe reaction, respectively.