In the local thermodynamic equilibrium approximation, we study the problems on low-temperature volume ignition of DT fuel. The temperature and compression threshold of volume ignition are given by solving the ion, electric and radiation energy equation. The ignitions points are affected by the albedo, DT mass, abundance ratio, etc. At the point of ignition, the temperature reduces with the increase of areal density. The trends of variations in radiation and electron temperature become closer to each other. The most important fact is that the subsequent development of the system can be given by analyzing the stationary solution based on the linear stability method. In other words, we can estimate whether the system can enter into a deep-burning state by using this method.%在局域热动平衡近似下，利用能量平衡关系，建立热核系统整体点火能量平衡方程，对该方程求解得到热核反应系统点火阈值。在计算和分析的基础上给出参数空间的点火关系，以及该条件受装量、核子数比以及返照率等因素的影响情况。点火时刻面密度越大，则对应的点火温度越低，并且电子-辐射温度脱离越小，越接近三温平衡的点火状态；反之则在点火时刻对应较大温度脱离。更重要的是，该分析方法还可以根据点火时刻系统的物理状态，通过线性稳定性分析方法，描述出系统的后续行为，也就是说，可以判断出这样的热核系统能否继续升温并实现深度燃烧。
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