Abstract: Interface not only distinguishes different things but also puts them together. Interface technology is a means by which to link different objects artificially. There is no doubt that certain interface technology does exist between man and machine， especially between man and todays information machine—computer. As an advanced product of manmachine interface， brainmachine interface involves knowing and practicing， and thus possesses the function of knowingpracticing. When information technology (IT) makes such a function possible， the increasingly sophisticated philosophical meanings will emerge. In the process， the traditional “doing by hand” and “doing with words” have developed into “doing by thinking”， thus making possible integrating peoples “knowing” and “practicing”. Meanwhile， the implied ontology， epistemology， humanism， political philosophy and other issues might also be highlighted.

Key words: manmachine interface, brainmachine interface, knowingpracticing interface, philosophical analysis