采用磁力搅拌式水卡计和电位差计、记录仪等二次仪表，组装一套测试装置，介绍了其结构、工作原理及使用方法．利用它测定出许多种煤炭的质量热容，并分析其影响因素．结果表明：煤炭质量热容的大小取决于煤炭固有的物理和化学性质，它随温度、水分、灰分和挥发分的提高而增大，随碳含量的增加而减小．研究积累了完整系统的数据资料，对许多矿井具有应用价值． Adopting magnetic stirring type water card meter, potentiometer, recorder and other secondary instruments to assemble a set of test equipment, the structure, working principle and using method are introduced. Use it to determine the mass of a variety of coal heat capacity, and analyze its influencing factors. The results show that the mass heat capacity of coal depends on the inherent physical and chemical properties of coal. It increases with the increase of temperature, moisture, ash and volatility, and decreases with the increase of carbon content. Research has accumulated a complete system of data, the value of many mines.