Abstract: Based on an upper window-fan frame aluminum profile with complex hollow structure and its optimized die structure, two optimal extrusion process parameters combinations which had the minimum standard deviation of velocity(SDV) and standard deviation of temperature(SDT) data were obtained respectively by analyzing the effects of extrusion speed, billet preheating temperature, container preheating temperature, die preheating temperature by means of orthogonal test method and Hyperxtrude13.0 software for numerical optimization. In addition, the velocity and temperature distributions in exit section of profile extruded by optimal extrusion process parameters were discussed. The results indicated that the most uniform velocity distribution with SDV merely being 1.3045 and temperature distribution with SDT only being 1.1823 in profile exit could be achieved for using A₁B₃C₂D₁ extrusion process parameters combination(extrusion speed 3 mm/s, billet preheating temperature 490 ℃, extrusion cylinder preheating temperature 450℃, die preheating temperature 440 ℃).