A　bimetallic　PtNi-vinyl　complex　as　catalytic　active　center　was　created　on　modified　rice　straw　biochar　by　introducing　an　appropriate　amount　of　cheap　Ni　component　as　a　catalytic　promoter.　The　constructed　bimetallic　catalyst　(PtNi-VTES-RSOC)　was　used　to　catalyze　hydrosilylation　of　terminal　alkenes　with　tertiary　silanes　to　produce　alkylsilanes　with　high　commercial　application　value.　The　experimental　results　proved　that　the　conversion　of　1-octene　96.5　%　and　selectivity　for　target　product　97.1　%　were　obtained　in　hydrosilylation　of　1-octene　with　triethoxysilane　catalyzed　by　PtNi-VTES-RSOC　with　mass　ratio　of　Pt/Ni　=　1.5:1　(molar　ratio　of　Pt/Ni　approximate　to　1:2)　under　mild　conditions　(atmospheric　pressure,　solvent-free,　50　degree　celsius　and　3　h).　It　also　possessed　higher　catalytic　ability　and　regioselectivity　for　hydrosilyation　of　long-chain　alkenes　(1-octadecene)　with　tertiary　silanes　compared　to　the　counterpart　monometallic　catalysts.　The　characterization　and　theoretical　calculation　results　demonstrated　that　the　introduced　suitable　amount　of　Ni(II)　could　affect　the　structure　of　original　Pt(II)-vinyl　complexes　and　form　a　stable　and　unique　bimetallic　vinyl　coordination　microstructure　by　using　a　shared　vinyl　group,　thereby　affecting　morphology,　structure,　and　catalytic　performance　of　the　as-prepared　bimetallic　catalyst　with　mass　ratio　of　Pt/Ni　=　1.5:1.　Changing　the　introduction　order　and　introducing　excessive　or　insufficient　of　Ni　(II)　would　both　disrupt　the　formation　of　this　special　structure　and　affect　the　catalytic　performance.　Additionally,　the　formed　stable　complex　structure　with　vinyl　groups　could　well　maintain　the　catalytic　stability.　The　study　results　exposed　that　the　as-prepared　bimetallic　catalyst　would　possess　a　great　industrial　application　potential　in　the　hydrosilylation　of　alkenes　by　efficiently　increasing　the　product　quality　and　reducing　operation　cost.