点堆模型通过线性化处理后，再经过拉普拉斯变换就得到传递函数模型。但分析发现,在稳定时假设反应性为零线性化处理后得到的传递函数模型有自身的问题。将对这类问题做一个概要性分析。分析方法是理论与实验相结合。理论分析借助系统动力学原理，重点在时域与频域结果的比较。实验方面则是基于工程参数借助计算机进行仿真实验，将时域和频域的仿真结果进行比较。通过比较分析，可以明显看到在稳定时假设反应性为零的点堆模型线性化处理存在的问题。针对该问题，指出了模型修改途径。

By the linearization method, the mathematic model of point reactor can be simplified. The simplified point reactor model could be further converted to the transfer function with the Laplace transfer tool. Until now, the point reactor transfer function is still used as the basic means for researching the nuclear reactor control system and the relative engineering items. However, through the analysis, it is found that the linearizd point reactor model based on the hypothesis that reactivity is zero when reactor is at the stable state has its own problems. This paper gives the concise analysis of the problems. The analysis method is the combination of theory and experiment. Theoretically, the focus is to compare the time domain results and the frequency domain results by means of the system dynamics principles. Experimentally, based on the engineering parameters, the focus is to compare the time domain computer simulation results and the frequency domain computer simulation results. Through the comparison analysis, the problems are exposed clearly. The paper gives the model modification access for the problems accordingly.