The　present　work　studies　the　immobilization　forms　of　lead　in　alkali-activated　cementitious　binders　(AACBs)　based　on　mine　tailings.　Through　deconvolution　of　Pb　4f　XPS　spectra　of　the　mine　tailings-based　binders,　the　immobilization　forms　of　lead　in　network,　and　lead　in　silicate　glass　of　PbO　center　dot　3SiO(2)　and　PbO　center　dot　7SiO(2)　were　first　quantitatively　presented.　The　Si-29　NMR　spectra　of　the　binders　synthesized　with　Pb(NO3)(2)　additions　from　0　to　6%　give　the　ratios　of　silicates　involved　in　the　formation　of　lead　silicate　glass,　ranging　from　0　to　10.56%.　In　addition,　images　of　scanning　electron　microscope　(SEM)　equipped　with　X-ray　microanalytical　mapping　and　results　of　zeta　potential　measurements　confirmed　the　immobilization　forms　in　the　mine　tailings-based　binders.　It　not　only　gives　fundamentals　for　the　solidification/stabilization　(S/S)　of　mine　tailings　through　alkaline　activation　process,　but　also　enriches　the　understanding　on　the　immobilization　of　heavy　metals　in　AACBs.