The isothermal and non-isothermal crystallization kinetics of poly(vinylidene fluorite) from the blends of poly(vinylidene fluoride) and poly(methyl methacrylate) were investigated for all samples of different blend ratios at various crystallization temperatures by differential scanning calorimetry technique. The overall rates of crystallization and the kinetic crystallizability were analyzed by the Avrami relation and Ziabicki''s approximate theory respectively. It was found that the Avrami constant K and the kinetic crystallizability G decreased considerably with increasing PMMA content, which suggested that the crystallization rate decrease with the increase of PMMA content in both isothermal and non-isothermal condition. The Avrami exponent n decreased slightly with increasing PMMA content although it remiained constant at dfferent crystallization temperature.