To explore collective intentionality in detail,we must answer the following four questions : What is intentionality. How can intentionality be collective. What is the neurophysiological foundation for collective intentionality . Why is collective intentionality important .Intentionality refers to the aspects of mental states by which they are directed at,or about,or of states of affairs in the world beyond themselves .To analyze collective intentionality,we should abandon the Cartesian specter of ″ego cogito,″break away from individualism and reductive analysis and return to irreducible holism .The discovery of mirror neuron system in the human brain lays a neruophysicological foundation for collective intentionality .No form of social life could exist without collective intentionality since it gives birth to social self,language,normative and institutional facts .