In this paper, the casting steel matrix composites were made by spraying the particles of Al 2O 3、 WC and FeO·Cr 2O 3 on melted steel respectively.The effects of some technological variables on the microstructure of the composites have been investigated. The result was that, the dispersion of particles are more easy and more homogeneous with decreasing the amount of particles and increasing the size of particles. WC are dispersing well in liquid steel due to its interfacial reaction and wettable with li...