Based　on　the　nonlinear　feedback　approach　for　realizing　any　continuous　time　scalar(hyper)　chaotic　signal　synchronization　control,we　have　designed　an　adaptive　feedback　controller　for　controlling　the　scaler　output　signal　of　a　smooth(hyper)　chaotic　system　to　synchronize　with　any　continuous　time　scalar(hyper)　chaotic　signal　under　some　assumptions.　The　result,　which　is　rigorously　proved　by　means　of　stability　theory,　not　only　can　adaptively　estimate　the　control　parameter,　but　also　has　some　robustness　against　parameter　variations　and　external　disturbances.　An　application　to　the　synchronization　of　two　(hyper)　chaotic　systems　is　given.