Abstract: In the traditional theories of civil law in our country,there is amount of dissent to the leading idea of the components of manifestation of intention,which is expressed as different cognitions of general constitutive(requirements) of legal acts in civil legislation.After analyzing the occurrence and development of manifestation positively,we could know that purpose intention,effect intention and expressing behavior,are all indispensable for manifestation of intention and they are components of manifestation of intention.However,expressing intention is not an essential component of manifestation of intention,because it can be absorbed by effect intention or by expressing behavior.