Abstract: The heat-insulating properties of heat insulating coatings were studied by adding different coating binders and changing micro bead size,temperature and coating thickness. It is found that the optimal adiabatic effect is obtained when the thickness of E800 binder based coatings is 0.42 mm. PA80 high-temperature gel is not suitable to be used in heat insulation coatings for its strong corrosive effect. Experimental results show that the coatings in the best adiabatic effect are based on soluble glass dissolved with 0.5% carboxymethyl cellulose. The smaller the micro bead size is,the better the heat-insulating properties of the coatings with the same thickness and binder are. The coating with the components of 5000 mesh micro beads and soluble glass based 0.5% carboxymethyl cellulose was chosen to paint on the steel ladle in-wall. The temperature drop per minute of the steel ladle with a 0.8 mm coating is 0.41℃ less than that without the coating. It is indicated that this coating is suitable to be implemented.