The　conduction　modification　is　an　effective　method　to　raise　the　releasing　ability　of　deposited　charge　in　polymers　under　space　environments.　The　inorganic　semi-conductive　filler　was　here　chosen　to　modify　the　polytetrafluoroethylene.　With　this　particular　filler,　the　volume　conduction　of　the　composites　varying　with　the　temperature　and　electrostatic　field　were　measured.　The　experimental　results　indicated,　with　different　contents　of　filler,　the　temperature-dependent　conduction　shown　a　regular　variation　and　the　threshold　field　of　nonlinear　conduction　property　under　different　temperatures　declined　but　nonlinear　tendency　significantly　increased　in　particular.　The　modified　polymer　is　considered　to　limit　the　level　of　deep　charging　to　a　safe　level.　©　2013　The　Institute　of　Electrical　Engineers　of　Japan.