Abstract: In order to understand the influence of the external parameters on the ice slurry and the refrigerating capacity of the ice slurry, this paper adopts the experimental method of the comparison and analysis of the melting process of the ice slurry under different heat addition and different flow velocities, and the inlet and outlet temperature and the ice content of the ice slurry in the inlet and outlet of the heat exchanger at different time, heat addition and different velocities are tested. The test results show that both the inlet and the outlet temperatures rise sharply after the exit temperature reaches to -3.95 ℃, and the duration of the internal ice slurry in the horizontal pipeline is inversely proportional to the mass velocity and the heating power based on the different mass flow velocities and heating power. It provides technical support for determining the design parameters of gas cooler.