将喷射泵引入与反应堆一回路系统相似的自然循环系统中，进行了实验研究。研究结果表明：安装喷射泵不仅可以提高系统自然循环能力，而且还可以改善系统自然循环过渡特性；系统初始流量和喷射泵的带流比对过渡过程的初期影响较大，加热段加热功率对整个过渡过程的影响都很显著，但加热段入口温度的影响并不明显。 The jet pump was introduced into the natural circulation system similar to the first-loop reactor system, and experimental research was carried out. The results show that the installation of jet pump can not only improve the natural circulation capacity of the system, but also improve the natural circulation transition characteristics of the system. The initial flow rate of the system and the jet flow ratio of the jet pump greatly affect the initial stage of the transition process. The influence of the transition process is significant, but the influence of inlet temperature at heating stage is not obvious.