The excited-state dynamics of 6-azauracil in different solvents have been studied using femtosecond transient absorption spectroscopy. The molecule is populated to the S-2 state with a pump pulse at 264 nm. Broad-band white light continuum which covers from 320 to 600 nm is used as the probe. With a global fitting analysis of the measured transient spectra, three decay time constants, i.e., <0.3, 5.2 +/- 0.1, and >1000 ps, are directly obtained in the solvent of acetonitrile. These newly observed lifetime constants are important in clarifying its decay dynamics as well as in providing a criterion for the ultrafast dynamics simulations in 6-azauracil using quantum chemical theories. In combination with previous theoretical works, the main decay channel is proposed: the initially populated S-2 decays to S-1 through internal conversion in <0.3 ps, followed by an intersystem crossing from S-1 to T-1 in 5.2 +/- 0.1 ps. The >1000 ps component is due to the decay of the T-1 state. A comparison of the excited-state dynamics in different solvents reveals that the decay from S, to T-1 shows a clear dependence on the polarity of the solvents. With higher polarity, the S-1 excited state decays faster. This observation is in line with the prediction by Etinski et al. [Phys. Chem. Chem. Phys. 2010, 12, 15665-15671], where a blue-shift of the T-1 state potential energy surface leading to an increase of the intersystem crossing rate was proposed. With the new information obtained in the present measurement, a clearer picture of the decay dynamics of 6-azauracil on the S-2 excited state is provided.