The　phase　transition　of　crystalline　in　poly　(vinylidene　fluoride)　from　α　anti-ferroelectric　to　β　ferroelectric　phase　achieved　by　electric　poling　treatment　with　a　high　temperature　has　been　investigated.　It　was　found　that　the　ferroelectricity　of　polymer　was　improved　and　the　polarization　depended　on　increasing　poling　electric　field　was　non-linear.　The　phase　transition　of　PVDF　in　electric　field　was　theoretical　simulated　based　on　dynamical　equilibrium.　The　results　show　that　the　effective　electric　field　affected　on　the　crystalline　is　50　MV/m,　which　accords　with　the　coercive　field　of　ferroelectric　PVDF.　At　the　same　time,　the　effective　electric　field　affected　on　the　amorphous　is　close　to　starting　electric　field　of　the　phase　transition.　It　demonstrates　that　the　method　of　dynamical　equilibrium　simulated　phase　transition　of　crystalline　in　PVDF　is　feasible.