研究了不同热压压力、热压方式对Ｃｏ－Ｍｎ－Ｎｉ－Ｏ热敏材料电性能的影响。热压烧结能够提高材料的电阻率及Ｂ值。Ｘ射线衍射分析表明，热压烧结材料有ＭｎＣｏ２Ｏ４、ＮｉＭｎ２Ｏ４和ＣｏＮｉＯ２三相组成。从扫描电镜照片可见，热压烧结材料晶粒细小、均匀、气孔率少，是提高其电性能的主要原因。调整热压压力可以有效地控制材料的电学参数 The effects of different hot pressing and hot pressing methods on the electrical properties of Co-Mn-Ni-O thermal-sensitive materials were investigated. Hot pressing can improve the material resistivity and B value. X-ray diffraction analysis shows that hot-pressed sintered materials are composed of three phases MnCo2O4, NiMn2O4 and CoNiO2. It can be seen from SEM images that the hot-pressed sintered material has small and uniform grain size and small porosity, which is the main reason for improving the electrical properties. Adjust the hot pressure can effectively control the electrical parameters of the material