  In order to fully exploit the physics potential of Jefferson Lab after 12 GeV
energy upgrade, a new Solenoidal Large Acceptance Device (SoLID) is proposed.
The SoLID spectrometer, with its unique capability of large acceptance and high
luminosity, is ideal for precision measurements in semi-inclusive DIS to study
transverse spin and transverse-momentum-dependent parton distributions of the
nucleon, and for parity-violating Deep Inelastic Scattering (DIS) to perform
precision tests of the Standard Model at low energy as well as addressing
specific issues in nucleon structure including charge symmetry violation, d/u
ratio and higher-twist effects due to di-quark. SoLID is also essential for
precision measurements of J/\psi electroproduction in the threshold region to
study non-perturbative gluon dynamics and interaction. Five highly rated SoLID
experiments and two "run group" experiments have been approved by the JLab
Physics Advisory Committee. The physics program is presented along with an
overview of the SoLID instrumentation and its current status.
