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Molecular dynamics has empolyed to study the mechanical properties of coaxial and bias(6,0)/(8,0)single-walled carbon nanotube(SWCNT)heterojunctions.It shows that the strain localization causes the result of significant deformation of structure and significant drop of stress under yielding strain.Moreover,the deformation take places below the heptagon ring in the thinner segment of the heterojunctions under tension at different temperatures,whereas under compression it occurs on the heptagon ring.