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.