  We present high resolution X-ray spectra of the X-ray bright classical T
Tauri star, TW Hydrae, covering the wavelength range of 1.5-25 AA. The
differential emission measure derived from fluxes of temperature-sensitive
emission lines shows a plasma with a sharply peaked temperature distribution,
peaking at log T = 6.5. Abundance anomalies are apparent, with iron very
deficient relative to oxygen, while neon is enhanced relative to oxygen.
Density-sensitive line ratios of Ne IX and O VII indicate densities near log
n_e = 13. A flare with rapid (~1 ks) rise time was detected during our 48 ksec
observation; however, based on analysis of the emission-line spectrum during
quiescent and flaring states, the derived plasma parameters do not appear
strongly time-dependent. The inferred plasma temperature distribution and
densities are consistent with a model in which the bulk of the X-ray emission
from TW Hya is generated via mass accretion from its circumstellar disk.
Assuming accretion powers the X-ray emission, our results for log n_e suggest
an accretion rate of ~10^{-8} M_sun yr^{-1}.
