Mortise and tenon joint structure was applied to the new energy automotive aluminum alloy frame, the stress of the cantilever structure was optimized.Throughthe heat-expansion and cold-contraction of Assemble method can realize the interference fit of mortise and tenon joint structure,by adopting themethod of combination of test and analysisofthefinite element simulation, the maximum bearing capacity of the mortise and tenonjointcomponentsof the differentinterferencewasstudied.Whenthecomponent is vertical,the mortise and tenon joint component of interference amount of 0.3 mm can withstand maximum bearing capacity is respectively 1.437 times as much as the interference amount of 0.2 mm or 2.467 times as much as the interference amount of 0.1mm.While the componenttishorizontal,thesecomponentsofdifferent interference amount that can withstand the maximum staticbearing capacity be same basically.Analysisofthefinite element simulationfurther shows thatthree groups of specimens have been destroyedandthe phenomenon oftenon on mobile occurred.