  The Weihai Echelle Spectrograph (WES) is the first fiber-fed echelle
spectrograph for astronomical observation in China. It is primarily used for
chemical abundance and asteroseismology studies of nearby bright stars, as well
as radial velocity detections for exoplanets. The optical design of WES is
based on the widely demonstrated and well-established white-pupil concept. We
describe the WES in detail and present some examples of its performance. A
single exposure echelle image covers the spectral region 371-1,100 nm in 107
spectral orders over the rectangular CCD. The spectral resolution
$R=\lambda/\Delta\lambda$ changes from 40,600 to 57,000 through adjusting the
entrance slit width from full to 2.2 pixels sampling at the fiber-exit. The
limiting magnitude scales to $V=8$ with a signal-to-noise ratio (SNR) of more
than 100 in $V$ for an hour exposure, at the spectral resolution
R$\approx$40,000 in the median seeing of 1.7$^{\prime\prime}$ at Weihai
Observatory (WHO) for the 1-meter telescope. The radial velocity (RV)
measurement accuracy of WES is estimated to be $<$10 m/s in 10 months (302
days) and better than 15 m/s in 4.4 years (1,617 days) in the recent data
processing.
