In　order　to　study　the　effect　of　the　glass　transition　temperature　(Tg)　on　space　charge　behavior　of　epoxy　resin　under　polarity　reversal　voltage,　the　epoxy　resin　samples　with　low　Tg　were　casted　in　vacuum　condition.　The　dielectric　spectra　of　the　samples　were　measured　over　the　frequency　range　of　10(-1)　to　106　Hz　at　different　temperatures.　At　different　temperatures　the　negative　poling　field　of　-30　kV/mm　was　firstly　applied　to　the　epoxy　resin　samples　for　90　min,　and　then　the　polarity　reversed　to　the　positive　field　of　+30　kV/mm　in　60　s　which　was　also　hold　for　90　min.　While　applying　polarity　reversal　voltage,　the　space　charge　in　samples　was　measured　with　improved　pulsed　electro-acoustic　(PEA)　system.　The　temperature　has　great　influence　on　polarity　of　accumulated　space　charge　in　samples.　At　low　temperature,　the　homocharge　distribution　was　observed　in　the　samples　under　the　poling　voltage,　and　the　electric　field　distributions　in　the　sample　before　and　after　the　reversal　are　different.　At　high　temperature,　the　movements　of　charge　carriers　in　the　samples　are　significantly　enhanced　and　the　heteocharge　accumulation　appears　in　the　vicinity　of　the　electrodes　under　the　poling　voltage.　During　the　reversal,　the　polarity　and　density　of　the　space　charge　at　high　temperature　can　timely　vary　with　respect　to　the　applied　voltage,　which　lead　to　the　electric　field　distributions　profiles　before　and　after　the　reversal　are　almost　completely　symmetrical.