In　this　study,　the　sinocalamus　oldhami　alkali　lignin　was　depolymerized　into　phenolic　products　in　a　combined　system　by　using　the　composite　alkali　and　Ni-W2C/activated　carbon　(AC)　as　catalysts.　FT-IR,　GPC,　TG,　2D-HSQC　and　GC-MS　were　used　to　analyze　the　composition,　structure　and　distribution　of　degradation　products,　and　the　synergistic　effect　of　metal　and　alkali　catalysts　on　the　depolymerization　of　lignin　was　also　studied.　The　results　showed　that　Ni-W2C/AC　and　composite　alkali　could　effectively　improve　the　catalytic　degradation　efficiency　of　lignin　under　mild　conditions,　94.4%　of　lignin　was　converted　and　17.18%　of　phenolic　monomers　were　obtained　under　260　degrees　C　for　5　h.　In　this　composite　system,　the　synergism　of　the　basic　sites,　the　metal　active　sites　and　the　Lewis　acid　sites　could　promote　the　cleavage　of　C-O　bonds　in　the　lignin　molecule　and　lower　the　char　formation　during　the　base-catalyzed　solvolysis.　Phenolic　monomers　were　mainly　composed　of　phenol,　2-methyl-phenol　and　p-cresol　etc.