The invention discloses an organization friend recommendation method and system in an organization social system. The method comprises the steps of acquiring phone address book data of a smart phone in which a client of an organization is; acquiring all organizations of the organization social system and the internal address book of each organization; building an alternative organization friend recommendation set according to phone numbers and e-mails of the phone address book and the internal address book of the organization, and optionally, setting a recommendation weight for organizations in the alternative organization friend recommendation set; and building an organization friend recommendation set according to the alternative organization friend recommendation set and the weight of each organization element. Through adoption of the method and system, organization friends whom an organization user may be interested in can be recommended to the organization user effectively, so that the organization user can build a social and cooperative relationship with a new organization conveniently.