The research focused on the PA66/PC/silicone rubber composites. By adding silicone rubber as a toughener, the composites were prepared via dynamic vulcanization. The morphology and properties of the composites were characterized by FTIR, TEM, SEM, XRD, etc. The FTIR spectrum of the composites presented an increase of the 1730, 1240, and 1450 cm(-1) that can be due to the C=O interaction and the presence of the O-CO-O group, and this fact can mean the formation of the PA66-PC copolymer. The crosslinking of silicone rubber in the PA66/PC matrix formed the net-like structure like semi-IPN, which is propitious to enhance the interaction between PA66 matrix and PC and in further makes the PC particles embed in PA66 matrix closely. Novel composites are gained with outstanding mechanical properties and high temperature resistance, so the combine toughening by silicone rubber and PC is an ideal toughening system owing to the synergistic effect. In addition, the PA66/PC/silicone rubber/OMMT composite exhibits better flexile strength and flexile modulus without weakening other mechanical properties. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 117: 2964-2971, 2010