The invention advances a signaling interacting method in IMS, able to reduce signaling interacting number and improve system stability. In the process of making signaling interaction between network element, SLF and HSS, the method comprises the steps of: a network element receives a message containing user ID; according to the user ID, it inquires HSS information corresponding to the user ID in its buffer memory; and it builds signaling interaction with attribute HSS determined by the HSS information. Thus, by addition of buffer memory to network element, the method omits the interacting process that I-CSCF inquires of SLF about user attribute HSS. Thus, the method reduces signaling interacting number and besides, improves system stability. |