Aiming at determination problem of the isobaric specific heat capacity for aviation fuel under high temperature and pressure, novel measurement device and method were developed. By the convective method between hot fuel and cold fuel, the calculation formula for heat capacity was derived based on the energy conservation principle. According to the self-made fuel flowing device under high temperature and pressure, the measurement apparatus was established by adding the assembly units of fuel mixing and temperature monitoring. Through analyzing the uncertainty of the related physical parameters, the relative expanded uncertainty of the isobaric specific heat capacity was calculated as ±3.78%. Pure water was used to calibrate the device, the reliability and accuracy of this method were testified. For common component n-decane in aviation fuel, isobaric specific heat capacity values at 2.1 and 3.0 MPa were determined, and determined results were agreed well with those simulated from Supertrapp software, with the derivation of less than ±5%.%针对航空燃料高温高压条件下的等压热容测试，建立了一种新的在线测量装置和测试方法。通过冷、热油对冲混合方式，基于能量守恒原理建立了等压热容的计算公式；基于自制的燃料高温高压流动装置，增加混油和测温部件建立了等压热容测试的实验装置。通过对相关物理量测试不确定度分析，计算得到等压热容的相对扩展不确定度为±3.78%；采用纯水进行标定，验证了该方法测试等压热容的可靠性和精确性。采用航空燃料中的常用组分正十烷，实验测定了在2.1和3.0MPa 压力下的等压热容数据，与采用 Supertrapp 软件的拟合值吻合很好，误差基本在±5%以内。
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