  We study electroweak baryogenesis in the E_6 inspired exceptional
supersymmetric standard model ( E_6SSM ). The relaxation coefficients driven by
singlinos and the new gaugino as well as the transport equation of the Higgs
supermultiplet number density in the E_6SSM are calculated. Our numerical
simulation shows that both CP-violating source terms from singlinos and the new
gaugino can solely give rise to a correct baryon asymmetry of the Universe via
the electroweak baryogenesis mechanism.
