This paper adopts modified Morozov secondary electron emission model to make research into the impact of the character of space-charge-saturated sheath near the insulated wall of Hall thruster on the near-wall conductivity, by the method of 2D particle simulation (2D+3V). The results show that, due to the sharp increase of collision frequency between the electrons and the wall under the space-charge-saturated sheath, the near wall transport current under this sheath is remarkably higher than that under classical sheath, and equal to the near wall transport current under spatial oscillated sheath in the order of magnitude. However, the transport currents under space-charge-saturated sheath and spatial oscillated sheath are different in the mechanism, causing different current density distribution under the above two sheaths, and a great impact of channel width on the near wall transport current under space-charge-saturated sheath. Hall thruster is a kind of plasma equipment discharging in the configuration of crossed electric and magnetic