An　experimental　device　of　rotary　damper　with　one　corrugated　disc　and　another　plate　disc　has　been　examined.　The　narrow　gap　between　two　discs　is　filled　with　electrorheological　fluid　(ERF)　(or　magnetorheological　(MR)　Liquid,);　so　electro-structural　effect　has　to　be　taken　into　consideration.　Computational　fluid　dynamics　(CFD,　FLUENT　software)　is　the　method　used　to　produce　comparative　performance　data　between　two　types　of　dampers.　Theoretical　and　numerical　studies　have　been　shown　that　the　total　output　torque　increment　for　corrugated　disc　rotary　damper　is　significant　larger　than　those　of　the　dual-disc　rotary　damper　at　ignoring　the　impact　of　electric　field　strength.　The　research　results　help　for　optima　design　of　a　pre　prototyping　procedure　with　ER　(or　MR)　fluid　damper.