6xxx series aluminium alloys have been widely applied in the transportation industry due to their good formability, corrosion resistance, and relatively cheap cost. Their moderate yield strength, however, limits their further application. A novel hybrid thermo-mechanical processing route, consisting of PreAgeing, Cold Rolling, and ReAgeing, was studied in this project in high Cu 6xxx alloy, AA6013, to achieve a good combination of yield strength and ductility. It was found that adding PreAgeing before low to medium cold rolling strain could substantially increase the strength without losing much ductility. However, to reach unprecedented high yield strength in AA6013 (130 MPa higher than its peak strength, 320 MPa) while keeping moderate ductility, high rolling strain on the naturally aged sheet is critical, followed by long-term annealing at 140 Celsius or short-term at 160 Celsius. The strengthening contribution of the shearable precipitates formed during the PreAgeing decreases with increasing rolling strain, which relates to the non-linear summation rule of the strengthening contributions from dislocation tangles and precipitates, as well as their lost strength due to repeated shearing events during cold rolling. During the cold rolling, the PreAgeing precipitates acted as stronger obstacles than the solute atoms during dynamic recovery, resulting in higher dislocation density and therefore higher strain hardening level, as well as the retarded cellular structures. The PreAgeing also strongly suppress precipitation in the ReAgeing step, resulting in reduced potential of further precipitation hardening. During the post-deformation annealing, the precipitates mainly heterogeneously nucleated on dislocations at an accelerated growth rate, exerting a strong pinning effect and therefore retaining the dislocation strengthening contribution while providing further precipitation hardening, which is the reason why the samples without PreAgeing were further strengthened and over-aged with shorter time. During the post-deformation annealing, two reactions, recovery and precipitation, competed with each other. The recovery mainly occurs at the beginning while the precipitation took longer during the annealing. To balance these two reactions, the optimum treating parameters were chosen so that the lost strengthening contribution from the recovery could be compensated by the precipitation hardening.