With the photochemical activity of titanium dioxide, the surface polymer encapsulation is conducted to titanium dioxide under ultraviolet light initiation. It studies the influence of light source type, light exposure time and rate of charge on the product structure; the dispersion of

titanium dioxide was compared before and after modification by using light absorption method; the modified titanium dioxide was prepared into thermal reflective insulation coating, and the difference of thermal barrier effect among uncoated, rock wool board and thermal reflective insulation coating was contrasted by self-made equipment.