The stress corrosion cracking （SCC） sensitivity was evaluated with parameters such as K

σ（strength index） and K

δ（elongation index）. The SCC sensitivities of T6

T7

T8 treated 2 519 aluminum alloy hot rolled plate were investigated. The experiments indicate that SCC sensitivity ranks in the order of T8

>

T7

>

T6 while mechanical properties rank in the order of T6

>

T7

>

T8. The potentiostatic polarization curves tests were carried out at room temperature for T6

T7

T8 treated 2519 aluminum alloy. The electrochemical corrosion behavior of stressed samples shows that the SCC sensitivity can be assessed by polarization resistance （R

p）

so the higher the R

pis

the better the SCC resistance is.