The crystallization of poly(vinylidene fluoride) (PVDF) films prepared from dimethylformamide (DMF) and dimethylacetamide (DMAc) solution and subsequently annealed at various temperature was studied by FT-IR and optical microscope.The results indicate that the crystallization of PVDF film depends on solvent,annealing temperature and film thickness.For all samples the content of β phase,F(β),decreases with elevating annealing temperature.When the annealing temperature is less than 90℃,the F(β) of PVDF-DMF system is higher than that of PVDF-DMAc system; however,at 90～160℃,a reversed observation is obtained.For the two systems,interestingly,the F(β) decreases drastically at the region of ca 90℃ and 80℃,respectively.In addition,the crystallization of PVDF is also affected by film thickness,higher film thickness will make the spherulite more resolved.