We　report　on　a　simple　and　effective　method　of　synthesizing　graphene-like　nanosheets　on　silicon　substrates　pre-deposited　with　a　carbon　film　or　carbon　nanodots　in　hot-filament(HF)CVD　from　a　methane　precursor.　The　results　of　field　emission　scanning　electron　microscopy　(FESEM),　transmission　electron　microscopy　(TEM),　and　micro-Raman　spectroscopy　(RS)　indicate　that　the　structure　of　graphene-like　nanosheets　is　changed　with　the　flow　rate　change　of　methane　and　the　pretreatment　of　the　substrate　surface.　The　catalyst-free　growth　of　graphene-like　nanosheets　is　related　to　the　diffusion　and　assembly　of　carbon　atoms　on　the　substrate　surface　and　the　separation　of　graphene-like　nanosheets　from　the　substrate　surface.