Hardness，tensile property and crystal orientation of 5052 Al alloy after rolling process and different subsequent heat treatments (200 ℃/1 h, 350 ℃/1 h, 500 ℃/1 h, respectively) were studied. The study indicates that the hardness and the yield strength of commercial purity aluminium can be effectively improved by rolling process. As the material recrystallization occurs at 244.8 ℃, the subsequent heat treatments of 350 ℃/1 h and 500 ℃/1 h will make the hardness and the tensile property of 5052 Al alloy continue to drop. The results of analysis based on XRD show that crystal orientation has little improvement by rolling process and its subsequent heat treatment. Quantitative calculation based Taylor's formula shows that the dislocation introduced by rolling deformation process is one of the factors of 5052 Al alloy strength enhancing