  Long-lived stau shows up in various supersymmetric models, like
gauge-mediated supersymmetry (SUSY) breaking model. At the LHC experiment,
long-lived stau is useful not only for the discovery of SUSY signals but also
for the study of the detailed properties of superparticles. We discuss a method
to obtain information on spins and chiralities of superparticles in the
framework with long-lived stau. We also show that such a study can be used to
distinguish SUSY model from other models of new physics, like the universal
extra dimension model.
