The study on the techniques for extraction of electroencephalography (EEG) singnal features was conducted based on human-computer interaction (HCI). It proposes a new way of feature extraction in the technical field of brain-computer interface (BCI), and through the expert intelligence endeavor to feature extraction by the HCI based on graphical presentation of multivariate data, effectively realized the combination of data-oriented pattern recognition and object-oriented domains, and overcame the obstacles...