  Spin transfer in high energy fragmentation process is determined by the
hadronization mechanism and spin structure of hadrons.It can be studied by
measuring the polarizations of hyperons and/or vector mesons in e+e-
annihilation, in the current fragmentation region of polarized deeply inelastic
lN-scatterings, and high p_T-jets in polarized pp-collisions.Theoretical
calculations have been made using different models.In this talk, I will briefly
summarize the main features of the models, the results obtained and the
comparison with available data. They can be used for future tests by
experiments.
