Effects of pressure and dual refiner（Al-5Ti-1B+Al-10RE） addition on microstructure of the squeeze casting hollow Al-Zn-Mg-Cu alloy drive shaft were investigated.The results show that with increasing in pressure

primary Al phase in the hollow Al-Zn-Mg-Cu alloy drive shaft is refined with spheroidization.With increasing in pressure to 160MPa

the coarse dendrites are disappeared

and the non-dendritic structure is observed

where the average grain size and equivalent roundness reach 25 μm and 0.73

respectively.The average grain size is significantly refined with the fluctuation of average equivalent roundness at 0.65～0.75 with decreasing in Al-5Ti-1B and increasing in Al-10RE.With 1% Al-5Ti-1B and 3% Al-10RE

the specimens can be obtained with 21 μm in average grain size and 0.70 in average equivalent roundness.