  Surface lithium abundance and rotation velocity can serve as powerful and
mutually complementary diagnostics of interior structure of stars. So far, the
processes responsible for the lithium depletion during pre-main sequence
evolution are still poorly understood. We investigate whether a correlation
exists between equivalent widths of Li (EW(Li)) and rotation period (P$_{rot}$)
for Weak-line T
  Tauri stars (WTTSs). We find that rapidly rotating stars have lower EW(Li)
and the fast burning of Li begins at the phase when star's P$_{rot}$ evolves
towards 3 days among 0.9M$_\odot$ to 1.4M$_\odot$
  WTTSs in Taurus-Auriga. Our results support the conclusion by Piau &
Turch-Chi\'eze about a model for lithium depletion with age of the star and by
Bouvier et al. in relation to rotation evolution. The turn over of the curve
for the correlation between EW(Li) and P$_{rot}$ is at the phase of Zero-Age
Main Sequence (ZAMS).
  The EW(Li) decreases with decreasing P$_{rot}$ before the star reaches the
ZAMS, while it decreases with increasing P$_{rot}$ (decreasing rotation
velocity) for young low-mass main sequence stars. This result could be
explained as an age effect of Li depletion and the rapid rotation does not
inhibit Li destruction among low mass PMS stars.
