Abstract: The ice layers in the deuterium-tritium capsule must be uniform and smooth enough, and the maximum temperature difference of the target surface is not higher than 0.1 mK for high quality cryogenic target. However, there are many factors affecting the cryogenic target temperature field. In this paper, the effects of sleeve wall thicknesses (0.2, 0.5, 0.75, 1, 1.25, 1.5, 1.75 and 2 mm), materials (AL5052, SS304 and high-purity copper) and hohlraum structures (single convex and double convex) on the cryogenic target temperature field were studied with FLUENT software. The results show that the temperature difference of target surface is small when hohlraum structure is double convex ring. With the increase of sleeve wall thickness, the natural convection intensity of the hohlraum and the temperature difference on the surface of the target decrease. There is a lower temperature and more uniform temperature field around target surface when copper is used as sleeve material, because of its high heat conduction and specific heat. Considering the wall thicknesses, materials and hohlraum structures, the surface temperature field of the target is best when the sleeve adopts high-purity copper with thickness of 1 mm, and the hohlraum structure is double convex ring.