The new CW-S antiaging coating which is used for the slope protection plastic bags in the Jiepai section of the middle Yangtze River has been passed the tests, such as the UV aging test, salt spray cycle test, acid resistance test and on site brushing testing.The results indicate that the new antiaging coating CW-S can substantially improve the durability of the slope protection plastic bags and enhance its strength and flexibility, this will better resist the erosion of silt carrying flow and will not easily rupture.