In summary, we demonstrated one simple and mild strategy for the hydrosilylation of steric sulfur-involving 1,1-disubstituted alkenes. The thioether group proves to be critical in facilitating this iridium-catalyzed process. This protocol was successfully utilized for the polymerization between disilane and diene. A plausible mechanism involving Ir-H species was proposed. Further application of this protocol toward more hydrosilylation polymerizations and modifications is in progress.