The　incipient　motion　of　soil　is　an　important　engineering　property　that　impacts　reservoir　sedimentation,　stable　channel　design,　river　bed　degradation,　and　dam　breach.　Due　to　numerous　factors　influencing　the　erodibility　parameters,　the　study　of　critical　shear　stress　(tau(c))　of　cohesive　soils　and　soil　mixtures　is　still　far　from　mature.　In　this　study,　erosion　experiments　were　conducted　to　investigate　the　influence　of　soil　properties　on　the　tau(c)　of　remolded　cohesive　soils　and　cohesive　and　noncohesive　soil　mixtures　with　mud　contents　varying　from　0%　to　100%　using　an　erosion　function　apparatus　(EFA).　For　cohesive　soils,　direct　linear　relationships　were　observed　between　tau(c)　and　cohesion　(c).　The　critical　shear　stress　for　soil　mixture　(tau(cm))　erosion　increased　monotonically　with　an　increase　in　mud　content　(p(m)).　The　median　diameter　of　noncohesive　soil　(D-s),　the　void　ratio　(e),　and　the　organic　content　of　cohesive　soil　also　influenced　tau(cm).　A　formula　for　calculating　tau(cm)　considering　the　effect　of　p(m)　and　the　tau(c)　of　noncohesive　soil　and　pure　mud　was　developed.　The　proposed　formula　was　validated　using　experimental　data　from　the　present　and　previous　research,　and　it　can　reproduce　the　variation　of　tau(cm)　for　reconstituted　soil　mixtures.　To　use　the　proposed　formula　to　predict　the　tau(cm)　for　artificial　engineering　problems,　experimental　erosion　tests　should　be　performed.　Future　research　should　further　test　the　proposed　formula　based　on　additional　experimental　data.