The invention provides a method and apparatus for synthesizing signaling XDR. The method comprises the following steps: obtaining XDR information of interfaces in a current service process, and adding timestamps to the XDR information of the interfaces; establishing an incidence relation of the XDR information of the interfaces according to the user identity identifier in the XDR information of the interfaces; sorting the XDR information associated with the user identity identifier according to the timestamps; adjusting the sequence of the XDR information associated with the user identity identifier according to the specific service flow corresponding to the current service; and generating the synthetic signaling XDR according to the XDR information associated with the user identity identifier after the sequence is adjusted. According to the method and apparatus provided by the invention, the ''user identity identifier'', the ''timestamp information'' and the ''specific service flow'' factors are comprehensively considered when the signaling XDR is synthesized, thereby improving the accuracy and success rate of synthesizing the signaling XDR.