Dendritic carbosilanes based on phenylethgnylmethylsilanes (PhC=C)(4-n)-MenSi (n = 0-2) as cores were synthesized. The building blocks of the dendrimers consist of double bonds (-PhC=CHMeSi-) in the inner shell and triple bonds [(PhC=C)(2)MeSi-] on the outmost periphery. The synthetic methods used the iterative alkynylation and hydrosilation cycle, which was composed of lithium phenylacethylide and dichloromethylsilane. The limiting generation of the dendrimer for the four branching type (PhC=C)(4)Si at a core molecule has 32 phenylethynyl groups on the third generation, 48 for the three branching type (PhC=C)(3)MeSi on the fourth generation, and 64 for the two branching type (PhC=C)(2)Me2Si on the fifth generation. The dendrimers were characterized by the use of NMR, Maldi mass, SEC, DSC, UV as well as elemental analysis.