Effects of equal channel angular pressing （ECAP） on microstructure and mechanical properties of spraying-deposited SiCp/7009Al composites were investigated. The results show that temperature has an obvious effect on the plastic behavior of the spraying-deposited composites during ECAP. The hard SiC particles were broken by the shearing stress

and many cavities in the broken SiC fragments occur

which can not be filled with the matrix alloy at a lower pressing temperature. Increasing the pressing temperature to above 350℃

the cavities from the SiC breakup can be filled with the matrix and flew with the matrix in a certain range

obviously improving the distribution uniformity

and the optimized pressing temperature is 400℃. The SiCp/7090Al composites experienced by Bc exhibits desirable mechanical properties and equiaxed grains with the average grain size of 400 nm can be obtained after four passes.