Core catcher, as a typical ex-vessel melt retention strategy, has been applied in some of pressurized water reactor (PWR) nuclear power plants. A new design of crucible-type core catcher located in reactor cavity is considered with featuring double water-cooled walls and a set of vertical cooling tubes penetrating through the corium pool with internal flow of coolant driven by natural circulation. This study investigates the interaction between a vertical cooling tube and the high-temperature molten material through experiments and computational analysis method. Experiments were conducted using a high-temperature molten material preparation system, named MAGMA, about 70 kg of molten ZrO2 was injected to the test section and interact with a single cooling tube. The experimental results implies that as soon as the melt contacted with the cooling tube, the ZrO2 crust was formed around the tube, and the structural integrity of cooling tube was still kept even though the local maximum temperature in outer wall was near the melting point of stainless steel. A two-dimensional analysis code was developed to simulate the temperature evolution at the melt-cooling tube interface, under varying the inner water flow rates. The analysis results also reveals that the initial phase of melt injection is characterized by the most intense thermal shock, primarily due to the sensible heat of the molten material. The rapid solidification of the melt on the outer wall of the cooling tube effectively protects the tube.