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A high alloyed Vanadis4(V4)steel was produced by spray forming process in Baosteel,and the microstructure of the as-sprayed steel and its evolution during hot rolling and annealing processes were characterized.It was found that the as-sprayed V4 steel has a homogeneous and fine scale microstructure with uniform dispersion of carbides.The hot rolling temperature is the key factor in controlling the evolution of type,morphology and distribution of carbides,as well as the matrix microstructure of the as-rolled steels.The optimized processing parameters for the as-sprayed V4 steel are rolling at 1050℃ and then annealing at 900℃.The microstructural evolution mechanisms during hot rolling and annealing are determined according to the microstructural analyasis of the material at different stages.