Although people have done a lot of research works on using correlation dimension to ana-lyse EEG signals,the method hasn t really been used in clinics In this paper ,we comparecorrelation dimension and power spectrum of a EEG segment and its surrogate data Results show that correlation dimension provides information ,which is not contained in power spec- trum. Combined with current clinical spectrum analysis method, this one will be helpful in clin- ics in respect of diagnosing brain diseases and determ...