All the parameters that affect the ice slurry generator performance were theoretically analyzed using the partial differential solving method in order to improve the heat transfer performance. According to the circle section jet theory, the relationship between the heat transfer efficiency and the water solution height was obtained. The results show that the heat transfer efficiency is not tess than 0.9 when the water solution height is 50 times of the nozzle diameter. Further, the volumetric heat transfer coefficient was derived, and several key points of the ice slurry generator design were presented as follows: to avoid heat transfer in radial direction, the generator height should be 100 times of the nozzle diameter, and the generator diameter should be less than 14 times of the nozzle diameter. Finally, experiments were done to verify the analysis results. The results obtained by both experiments and analysis agree that with the increase of both the gas mass flow rate and the gas specific heat capacity, and with the decrease of both the gas inlet temperature and the water solution volume, the volumetric heat transfer coefficient increases.