The Crucible-type Core Catcher is a device for collecting and cooling molten core substance. It is used to prevent the reactor core from reacting directly with the concrete raft foundation of containment, and to alleviate the consequences of serious accidents. At present, Russian research institutions have done a lot of research on the Crucible-type Core Catcher. And Tianwan Nuclear Power Station has already adopted it. With the localization of nuclear power technology and the improvement of reactor power, Core Catcher has attracted the attention of domestic relevant research units. Under this background, some research has been carried out in order to deepen the understanding of this technology.In this paper, a simplified model is built based on the Crucible-type Core Catcher. Heat transfer is optimized by adding heat-conductive rods in sacrificial material region. There are three arrangement modes and three number of heat-conductive rods. Numerical calculation is carried out to obtain the required time of melt-solidification by FLUENT. According to the results, conclusions are obtained as follows: 1.Heat-conductive rods can effectively reduce the time required for solidification; 2.Most of the heat of the molten substance is exported from the side of the Crucible-type Core Catcher; 3.The solidfication effect of the molten substance is positively related to the uniformity of heat-conductive rods in the horizontal direction. In this paper, the heat transfer optimization of molten substance in the Crucible-type Core Catcher is studied, which offers a new design concept for the optimization of the device.