  We have established the relations between the baryon-baryon scattering phase
shifts and the two-particle energy spectrum in the elongated box. We have
studied the cases with both the periodic boundary condition and twisted
boundary condition in the center of mass frame. The framework is also extended
to the system of nonzero total momentum with periodic boundary condition in the
moving frame. This will be helpful to extract the phase shifts in the continuum
from lattice QCD data using asymmetric volumes.
