Nine sets of Al-Cu alloy specimens were produced by squeeze casting based on the processing parameters from four factors-three levels orthogonal testing.The S/N（signal/noise） ratio and variance of hardness

tensile strength and elongation were analyzed using Taguchi methods.The results show that applied pressure is the most important factor affecting S/N ratio

and its contribution to tensile strength

hardness and elongation reaches 47.71%

47.90% and 41.76%

respectively.Pouring temperature and die preheating temperature are both significant factors to S/N ratio while applied pressure time is an non-significant factor.The optimized parameters are as follow:pouring temperature of 730 ℃

die preheating temperature of 200 ℃

applied pressure of 75 MPa and holding-pressure time of 45 s.