Abstract: By using the existing T6 heat treatment process as a theoretical basis, the temperature and time parameters of solution and aging were adjusted reasonably, and the experiments were carried out in laboratory, pilot and workshop. By compare, adjust, amend and determine the most optimal process parameters, aluminum alloy T6 heat treatment process was improved. The study results showed that the optimizing technology plans included: solution in 535 ℃ for 6 h, aging in 130 ℃ for 3 h; solution in 540 ℃ for 4 h,aging in 140 ℃ for 2.5 h; solution in 540 ℃ for 5 h, aging in 140 ℃ for 3.5 h; solution in 540 ℃ for 5 h, aging in 140 ℃ for 4 h. After the process was optimized, the performance and microstructure of A356 aluminum alloy met the standards, on the basis of ensuring the original performance, the costs were reduced and the economic efficiency of enterprises was improved.