Aim to improve mechanical properties of the casting aluminum components, a novel process that combined squeeze casting with local forging was proposed. THERCAST ® and FORGE ® were used to simulate the combined forming process of the automobile control arm. The effects of pouring rate, forging temperature and T6 heat treatment on microstructure evolution and mechanical properties of the samples formed by this combined process were investigated. The results showed that the pouring rate and forging temperature have a negligible effect on microstructure of those samples. The combined process of squeeze casting and forging could obviously refine microstructure, eliminate porosity and improve micro-hardness. After T6 heat treatment, the Si particles were dramatically spheroidized, and the micro-hardness was improved.