A carpet structure composed of high purity cup-stacked carbon nanotubes （CSCNTs） was synthesized by a catalytic chemical vapor deposition method. In a 15-rain growth time, the CSCNT carpet with a height up to -300 μm and carbon purity above 99.9 mass% was prepared. Transmission electron microscopy observations indicated that the CSCNTs with diameters ranging from 80 nm to 230 nm consist of truncated conical graphene layers. Based on the experimental results, a possible ＂base growth＂ mechanism was proposed for the CSCNTs. The CSCNT carpet is highly flexible and superhydrophobic, showing a contact angle of - 155°. It can be easily harvested from the original growth substrate and be transferred to target substrates. It may therefore find applications as a water-proof and self-cleaning coating layer.