Alkylsilanes,　obtained　from　hydrosilylation　of　alkenes　with　tertiary　silane,　have　high　commercial　application　value.　It　is　crucial　to　develop　a　heterogeneous　Pt-based　catalyst　with　high　activity　and　high　regioselectivity　to　catalyze　this　hydrosilylation　reaction　under　solvent-free　and　mild　conditions.　Herein,　a　stable　Pt(II)-vinyl　complex　with　unique　structure　was　successfully　constructed　on　oxidized　rice　straw　biochar　through　reasonable　structural　design　and　modification　steps.　Pt　particles　on　the　as-prepared　catalyst　(Pt-VTES-RSOC)　were　evenly　dispersed　with　relatively　minimum　particle　sizes　(0.3　similar　to　2.5　nm).　Compared　to　classic　homogeneous　catalysts,　Pt-VTES-RSOC　showed　superior　activity,　great　regioselectivity　for　tertiary　silanes　and　high　reusability.　The　apparent　kinetic　models　for　representative　reactions　over　Pt-VTES-RSOC　were　also　proposed　to　simulate　the　catalytic　process　under　suggested　reaction　conditions　for　clarifying　the　reaction　mechanism.　The　study　proved　that　Pt-VTES-RSOC　would　have　a　good　industrial　application　potential　in　hydrosilylation　of　alkenes　with　tertiary　silanes　by　reducing　operation　cost　and　increasing　the　product　quality.