In　this　paper,　the　influence　of　thermally　poling　and　corona　charging　on　electric　properties　of　PVDF　films　was　investigated　by　Fourier　transform　infrared　(FTIR),　differential　scanning　calorimetry　(DSC),　ferroelectric　hysteresis　loops　and　leakage　current　measurement.　The　results　showed　that　the　ferroelectric　properties　of　PVDF　films　were　both　improved　by　thermally　poling　and　corona　charging,　but　the　leakage　properties　of　PVDF　films　were　distinct　due　to　different　poling　temperatures,　poling　electric　fields　and　poling　times.　With　the　effect　of　high　electric　field　at　high　temperature　in　thermally　poling,　the　dipoles　were　oriented　along　the　direction　of　electric　field　completely,　which　caused　more　polar　β　crystalline　transited　from　non-polar　α　crystalline.　So　it　was　found　that　the　crystalline　degree,　β　crystalline　content　and　remanent　polarization　of　thermally　poled　PVDF　films　were　higher　than　those　of　corona　charged　PVDF　films.　The　reason　that　caused　leakage　current　was　also　analyzed.　The　space　charges　injected　during　the　poling　process　were　stored　in　the　shallow　traps　of　PVDF　films　for　corona　poling　and　in　the　deep　traps　for　thermally　poling,　respectively.　Therefore,　the　leakage　current　of　corona　poled　PVDF　was　unstable　than　that　of　thermally　poled　PVDF　films.