Thixoforging tests were conducted on a 2000 kN press to form semi-solid 7A04 alloy parts. The results show that integrally formed part with compact structure and clear shape is obtained by thixoforging process.  The microstructure and mechanical properties of thixoforging parts are related to their billets making method.  The microstructure of such parts made by SIMA method is mainly the fine and uniform recrystallization texture. In addition, plastic deformation was found locally during the elongated process and tearing ridges were found at fracture surfaces, which make the mechanical properties of thixoforging parts superior to that of extruded billet.  The elongation rate and strength of thixoforging parts came to the highest value when the SIMA billet was reheated to 600 ℃ for 10 min, which is similar to that of hot extruding billet.  Compared to the extruded state, the strength and elongation rate made by SIMA method were increased to 11.8% and 78.5%, respectively.