PRECISION STUDY OF MSSM AT FUTURE E(-) LINEAR COLLIDERS()E()

The lighter scalar tan lepton <(tau)over tilde>(1) may be the lightest scalar lepton and therefore would be found earlier in future collider experiments. We point out the impact of the measurement of the mass a nd the mixing angle of <(tau)over tilde> to discriminate the models of SUSY breaking. Furthermore, the measurement of the polarization of ta u lepton (P-tau) from the decaying <(tau)over tilde>(1) helps to deter mine the Yukawa sector of minimal supersymmetric standard model. We pr esent our MC study of the production and the decay of <(tau)over tilde >(1) lepton at a future linear collider at root(s) = 500 GeV. The mass , mixing angle of <(tau)over tilde>(1) and P-tau(<(tau)over tilde>(1)- ->tau(chi 1)(0)) would be measured precisely at the future LC.