Hadron Polarization in the Electron Ion Collider

Electron Ion Collider (EIC) requires high polarization for both ion and electron beams. To reach 70% proton polarization, six snakes will be used for EIC hadron storage ring (HSR). Extensive simulations have been done to make sure the polarization will be preserved through HSR. The simulations show that with pre-cooled beam size, the polarization can be preserved. In addition, polarized He3 acceleration has been simulated. Polarized deuteron has also been explored. This paper will summarize the overall strategy and status of the EIC hadron polarization.