According to the appearance of defects in marine environment of high durability fair-faced concrete,we carry out the drum and square model test，and study the effect of admixture on the appearance of fair-faced concrete.The results show that the fair-faced concrete with slag has more surface bubbles and larger diameter.The color of fair-faced concrete with slag and fly ash is black and dark.The bubble situation of the concrete with slag and stone powder is the same as that mixed the slag only.The concrete with slag and silicon powder has more color bright uniform,less bubble and smaller bubble size,and the overall uniformity is the best in double doped system.Compared with all other series of concrete,the concrete with slag,fly ash and silica fume has the best appearance,the color is bright and uniform,and the bubble is less.We apply the last kind of concrete to a marine environment under water concrete engineering,which achieves a good result.