Throughtherelativepermeabilitytestonthetruncatedconespecimensofyellowriversuperfinesandplasticconcrete(YRSSPC),effectsofinfluencingfactorsincludingthereplacementratesuperfinesand(R),water cementratio(W/C),thepercentageofclayinthecementitiousmaterial(c1)andthepercentageofcementinthecementitiousmaterial(c2)upontherelativepermeabilitycoefficientofYRSSPC(Kr)werestudied.Basedontheexperimentalresults,acomputationalmodelwasproposedtocalculateKrofYRSSPC.TheresultsshowedthatRhassignificanteffectonthegraincompositionoffineaggregate,andthenithaseffectonKr.KrtendstodecreaseasRincreases.WhenRisover25%,thepermeabilityofYRSSPCischangedsignificantly,so25%isthecriticalpoint.ThebestRis50%.W/ChassignificanteffectonKr.Krincreaseswith the increase ofW/C.TheclaycontentandthecementcontenthaveeffectsonKr.Krdecreasesfirst,andthenincreaseswith the decrease ofc1.Krdecreaseswith the increase ofc2.