A registration method and system for a common service entity (CSE) relate to the field of machine type communication; solve the problem that a CSE registration mechanism cannot implement an application interactive function. The method includes: an originator CSE sending a CSE resource creation request message to a receiver CSE; the receiver CSE detecting whether a resource corresponding to an identifier of the originator CSE exists in local; the receiver CSE creating a resource for the originator CSE when no resource corresponding to the identifier of the originator CSE exists in local, setting a resource name according to the identifier of the originator CSE, and saving a type of the originator CSE as an attribute, and generating a CSE resource creation response message indicating that the resource creation is successful; the receiver CSE sending the CSE resource creation response message to the originator CSE.