According　to　performance　experiment　of　partially　restrained　steel　frame　with　RC　infill　walls　(PSRCW),　the　overstrength　behavior　has　been　analyzed,　and　ductility　reduction　factors　of　PSRCW　is　proposed　based　on　equal　collapse　rule.　R-μ-T　empirical　formula　from　Newmark-Hall　was　used　to　deduce　ductility　and　strength　reduction　factors　of　PSRCW　under　the　rare　level　of　earthquake.　In　order　to　make　the　research　be　consistent　with　seismic　code,　this　paper　also　gives　ductility　and　strength　reduction　factors　of　PSRCW　under　the　moderate　level　of　earthquake.　These　suggestions　can　provide　references　for　reasonable　design　of　PSRCW.