Abstract: The effects of three different solution time periods and two solution methods on the microstructure and mechanical properties of TC11 alloy were investigated via OM,SEM and mechanical property tests.The results show that after the TC11 aluminium alloy solution treated for 3 hrs,the metastable β crystal texture orientation had a deflection and the α secondary phase in intermediate β phase was much coarsened.After the alloy aging treated,the fully decomposition and more precipitation happened on the metastable β matrix,while finer sequential secondary phase appeared in the boundaries of β phase layer.The super-solution occured as the result of solution time,secondary phase become finer in aging stage which weakens the effect of impeding dislocation movement and thus decreased the yield strength.The mechanical properties of STA condition by separate solution was lower than that by sequential solution.