The coordination crosslinking reaction of (NBR/PVC)/CuSO4 composites was investigated by differential scanning calorimetry(DSC) and Fourier transform infrared(FT-IR) spectrometry.The kinetic parameters of coordination crosslinking were evaluated by Kissinger method.The results showed that (1) the existence of PVC in the system accelerated the coordination crosslinking and reduced the activation energy of the coordination between nitrile groups (—CN) and copper ions(Cu2+);(2) the content of CuSO4 didn't affect the coordination crosslinking reaction.