Although reaction of SiO

2

with liquid aluminum can occur at a certain condition based on thermodynamic analysis

it is difficult to make the reaction at temperature less than 1000℃ due to poor wettability between SiO

2

and liquid Al.Effects of different pretreatment methods on SiO

2

particle size were examined in Al-SiO

2

reactive system

and reactive kinetics and finished product in the system were analyzed by DSC（differential scanning calorimeter）and XRD（X-ray diffraction）.The results indicate that the smallest SiO

2

size with average diameter less than 1μm can be obtained after ball milling pretreatment.Wettability of SiO

2

particle with liquid Al can be improved with decreasing in SiO

2

particle size

which can decrease reactive temperature.Finished reactive temperature of SiO

2

with liquid Al is less than 1000℃ with SiO

2

particle size less than 2μm.