Monobenzyl toluene\dibenzyl toluene（M\DBT）is presently the first choice of liquid medium in the industry of power capacitor both at home and abroad.The study on the influence of temperature

voltage

residue and additives on the M/DBT aging properties involves in the both application performance and operation life of power capacitor.The influence extents of the temperature

voltage

the chlorine content and additives contents is studied by way of aging breakdown test to the thermal property

electrical property of M\DBT and stepping progressive voltage methods to the model capacitor

the improvement measures and method are proposed at the same time of knowing the influence

so to promote and push the domestic M\DBT step into advanced level in the world.