A type of silicone elastomer PDMS?GA?TAPA was prepared based on the Schiff?Base reaction by cross?linking α,ω?aminopropyl terminated polydimethylsiloxane (PDMS?NH₂),glutaraldehyde (GA) and tris(4?aminophenyl)amine (TAPA).The structure of PDMS?GA?TAPA was characterized by FT?IR, ¹H?NMR and PDMS?GA?TAPA, which showed excellent chemical and thermal stability proved by high temperature dissolution experiments.The PDMS?GA?TAPA has excellent mechanical strength,with tensile strength up to 3.6 MPa and elongation at break up to 112%. In addition, the mechanical properties of PDMS?GA?TAPA can be regulated and optimized by adjusting the crosslinking density of PDMS?GA?TAPA.When the PDMS?GA?TAPA was treated on a heating table at 100 ℃ for 1 h, the elastomer could realize self?healing with efficiency up to 83%.