As new type of indoor decoration materials, gypsum plasters have good development prospect in fire resistance, heat preservation and insulation, environmental protection, etc. The purpose of this paper is to prepare gypsum plaster using desulphurization gypsum, waste mycelium retarder (WPM) and some additives. The formulation of surface gypsum plaster was obtained: desulfurization gypsum 93%, cement 2%, granulated blast-furnace slag 4%, water retention agent 1%, water reducing agent 0.05%, WPM retarder 0.06%. The base plaster was obtained by mixing surface gypsum plaster with medium sand in mass ratio of 1:1. 5. The thermal insulation gypsum plaster was prepared with surface gypsum plaster and perlite by mass ratio of 5:1.8. The products conform to (JCT517-2004) standards.
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