Conduction behaviors of carbon black(CB)filled poly(methyl vinyl siloxane)(PMVS)vulcanites in loading and unloading processes were investigated．The results revealed that the resistance decreased with time after loading under constant stress and also after unloading

exhibiting a typical relaxation behavior．According to the resistance relaxation time and the most extent of resistance relaxation

relationships between the structure change of conductive network and the resistance relaxation were analrsed．Simultaneously

the effect of CB content on resistance relaxation was discussed．It was found that under 2～4 MPa stress．tWO relaxation times were detected independent of the content of CB．which were related to tIle structure change of conductive networks in different dimension．After unloading the recovery of matrix deformation resulted in the occurrence of structure relaxation．and the relaxation times incleased with the content of CB．