Al-Si　alloy　was　widely　applied　in　automobile　engine　parts　to　realize　weight　reduction.　The　influence　of　casting　temperature　on　the　microstructure　of　die　casting　Al-Si-Cu-Mg　alloy　was　studied　in　this　paper.　Based　on　ZL　101　alloy,　the　strength　was　improved　with　addition　of　0.8%　Cu　element.　The　influence　of　pouring　temperature　on　microstructure　was　investigated　using　optical　microscope　and　electron　probe　micro-analysis　(EPMA),　and　T1　heat　treatment　was　optimized.　The　primary　α-Al　was　more　coarsened　when　the　pouring　temperature　rose　from　660C　to　690C.　The　solid　solubility　of　Cu　in　α-Al　was　0.2406　wt%,　analyzed　by　EPMA.　Considering　the　solid　solubility　of　Cu　and　avoiding　porosity　at　high-temperature,　T1　heat　treatment　was　reasonable　and　affective.　The　micro-hardness　reached　to　a　peak　value　of　114　HV　during　aging　at　a　temperature　of　175C　after　10　h.　Therefore,　175C×10h　aging　was　the　most　appropriate　heat　treatment　process.　©　2017　Trans　Tech　Publications,　Switzerland.