Carbon nanosheet films were deposited on AI substrates by using plasma assisted chemical vapor deposition (PACVD) technique.And after being peeled off from Ai substrates,carbon nanosheet powders (CNSPs) were obtained.In Raman spectrum of carbon film,there was a strong and broadened peak at about 1,580cm~(-1),indicating a carbon diamond-like film.Atomic force microscope image showed that the carbon diamond-like film had a grain size less than 100 nm,and its surface roughness Ra was 17.95 nm in an area of 5×5μm~2.The CNSPs were irregular sheets with curly edges and a length of several micrometers to several hundreds of micrometers.The BET surface area of CNSPs was 6.66 m~2/g with no micro-pore present,which was confirmed by N_2 adsorption-desorption characterization.In the adsorption testing,when the relative pressure P/Po was higher than 0.3,the adsorption behavior did not follow the Langmuir equation.The addition of CNSPs to carbon black (catalyst support) could improve hydrodesulfurization performance of carbon supported Ni-W catalysts for diesel oil. Carbon nanosheet films were deposited on AI substrates by using plasma assisted chemical vapor deposition (PACVD) technique. After after peeled off from Ai substrates, carbon nanosheet powders (CNSPs) were obtained. In Raman spectrum of carbon film, there was a strong and broadened peak at about 1,580 cm -1, indicating a carbon diamond-like film. Atomic force microscope image showed that the carbon diamond-like film had a grain size less than 100 nm, and its surface roughness Ra was 17.95 nm in an area of ​​5 × 5μm ~ 2.The CNSPs were irregular sheets with curly edges and a length of several micrometers to several hundreds of micrometers.The BET surface area of ​​CNSPs was 6.66 m ~ 2 / g with no micro-pore present, which the adsorption behavior did not follow the Langmuir equation. The addition of CNSPs to carbon black (catalyst support) could improve hydrodesulfur ization performance of carbon supported Ni-W catalysts for diesel oil.