Ta_xHf_1-xC(0 4000 K), high hardness (~ 30 GPa), low coefficient of thermal expansion, excellent oxidation resistance, and excellent ablation resistance. Over the past decades, some extreme conditions required for aerospace industry have greatly promoted the development of Ta_xHf_1-xC materials, and dozens of literatures were published in this area. In this paper, the research progress of Ta_xHf_1-xC solid solution ceramics was introduced in terms of powder synthesis techniques, densification methods and mechanism, mechanical properties at room temperature, thermophysical properties, oxidation and ablation resistance. Advantages and disadvantages of three common techniques (solid solution between metal carbides, carbonization reaction of metals, and carbothermal reduction of metal oxides) for synthesizing Ta_xHf_1-xC powder as well as the difficulties in densification of Ta_xHf_1-xC solid solution ceramics were analyzed. Influence of sintering process on microstructure and mechanical properties at room temperature of Ta_xHf_1-xC solid solution ceramics was discussed briefly. The hardness, elastic modulus, K_IC, melting point, thermal conductivity, coefficient of thermal expansion, oxidation and ablation behavior of Ta_xHf_1-xC solid solution ceramics with different Ta/Hf ratios were summarized. It revealed that Ta_xHf_1-xC solid solution ceramics will obtain a good performance on both mechanical properties and oxidation resistance when Ta/Hf was approximate 1. Furthermore, the remaining challenges and future outlook of Ta_xHf_1-xC solid solution ceramics were also addressed.