Abstract: In order to fabricate in situ TiC_P/Fe composites under air condition by the synthesis of TiC in Fe-Ti-C melt, the effects of three kinds of covering agents on the oxidization ratio of element Ti in the melt were studied, and the microstructures and mechanical properties of the prepared composites were also analyzed. The results show that the developed mixed salts type covering agent can be used to produce in situ TiC_P/Fe composites under air condition, in which the TiC_Particles exhibit finer size and homogeneous distribution in the matrix structure, resulting in the composites, especially the quenched composites, to have higher properties.