Poly（vinylidene fluoride）-based polar dielectrics are one of the most promising materials to attain high energy density in metallized film capacitors

and the self-healing characteristic is critic al to perform ance.The scale-up films and capacitor prototypes of poly（vinylidene fluoride）/polymethyl methacrylate（PVDF/PMMA） blend are fabricated and their breakdown strength

self-healing energy and et al.were compared with polypropylene through investigations on electric strength test

microscopic observation and calculation.It is found that the breakdown field shows a decline about 21% in the scale-up films

and the capacitors present a further decreased breakdown strength（54% of breakdown strength of films）.The self-healing area of PVDF/PMMA is larger than that in poly propylene.Further equivalent circuit model has been established to describe the self-healing process of PVDF/PMMA metallized film capacitor.