The hot-rolled vacuum-smelted high titanium steel plate for support was selected as the test material, and the martensitic structure with a specific structure was obtained by controlling the degree of rolling deformation degree. Then, the microstructure and TiC precipitated phase changes of the steel under different rolling deformation degrees were compared, and the changes of mechanical properties of the steel were tested at the same time. The research results show that after gradually increasing the hot rolling deformation amount, the finer grains are obtained, and the martensite lath bundles with smaller width dimensions are formed; the sizes of TiC particles are more uniform and significantly reduced, and the TiC particles are fully fragmented and uniformly distributed; a larger proportion of TiC particles with a particle size of no more than Φ15 nm is formed, and the degree of austenite deformation also increases significantly, forming finer nano-TiC particles; the specimen reaches higher tensile strength and yield strength, forms a larger non-uniform elongation, while the uniform elongation remains constant, and the impact performance of specimen also shows an increasing trend.