In　this　paper,　the　maximum　Lyapunov　exponent　and　the　correlation　dimension　are　first　utilized　to　determine　the　chaotic　characteristics　of　audio　spectrum　based　on　nonlinear　analysis　method.　Next,　the　maximum　Lyapunov　prediction　and　codebook　mapping　are　used　to　recover　the　fine　structure　and　envelope　of　high-frequency　spectrum　separately.　By　using　above　two　approaches,　the　bandwidth　of　wideband　audio　is　extended　to　super-wideband.　Finally,　this　bandwidth　extension　method　is　applied　into　G.722.1　audio　codec.　The　test　results　indicate　that　the　proposed　method　outperforms　the　conventional　algorithms　in　most　cases,　and　the　perceived　quality　of　the　extended　super-wideband　audio　in　the　real　wideband　audio　codec　system　is　comparable　with　that　of　directly　reconstructed　audio　using　super-wideband　audio　coding　at　the　bit-rate　of　24　kb/s.