Based on the data of wind tunnel test by Tokyo Polytechnic University, and validated RNG model hipped building surface pressure low reliability study. Study that cornice length and height of the influence on the low hipped roof surface wind pressure deeply. The results show that: The length and height of the cornice on the roof overhangs pressure affect apparently when cornice overhanging the same length, vertical height increases with cornice, windward wind suction increases, the vertical height unchanged when the cornice height of 0.5m or 1.0m, with overhanging eaves to increase the length of the windward side of the negative air pressure decreases, the cornice overhang length of 1.5m, 1.0m vertical height of the surface is most conducive to windresistant design, the conclusion can be shed some light on design of lowrise residential areas where typhoon occur frequently.