The energy dispersive X-ray analysis method can measure the elemental compositions and changes of the epoxy adhesive in adhesive/graphite joints.The weight loss of the adhesive in the adhesive/graphite joint can be measured with EDX

so the thermal decomposition dynamics of the epoxy adhesive in the joint can be determined.The values of thermal decomposition energy of the adhesive in the joint and in the air atmosphere were -35.89 kJ8226;mol-1 and -34.43 kJ8226;mol-1

respectively.The rate of thermal decomposition of the adhesive in the joint was lower than that of the adhesive in the air

because air was excluded in the joint.It auord with the rule of thermal decomposition of adhesive.This is a new method of measuring some properties of adhesive in the joints.