Abstract: Catalytic behaviors of platinum nanoclusters supported on hyperbranched polyamide for the hydrogenation of benzene were studied. A series of hyperbranched polyamides with different structures were synthesized by direct condensation polymerization, and the corresponding Pt nano-cluster/hyperbranched polyamide (Pt-HBPA) catalysts were prepared. The structures of catalysts were characterized by TEM, FT-IR, XRD and XPS. Results showed that the average diameter of the Pt particles was about 3—5 nm. These Pt particles may coordinate with N and O in hyperbranched polyamide. Compared with the pure Pt nano-clusters, Pt-HBPA catalyst greatly improved the conversion of benzene by about 13 times. Meanwhile, cyclohexene was found to be one of the products. These catalytic systems exhibit high cataly-tic activity and moderate selectivity for cyclohexene.