Two different solid contents of nano ATO suspensions were prepared. ATO suspension and water-borne polyurethane were used to prepare the nano transparent thermal insulated paints by special technologies. The coating was coated on the surface of clean glass, which was dried at the room temperature. The coated glasses were analyzed with U-4100 spectrophotometer. The effect of paint proportion, coating thickness and solid content of suspensions on optical performance were discussed in this paper. The analysis of optical performance showed that the coated glass has good thermal insulation performance, SC 0.61, τvis 60.6%, blocking 66.43% of ultraviolet.