In port engineering, the problem of cracks in surface of less reinforced concrete breast wall is quite common. The cracks not only influence the visual quality, but also weaken the durability of structures when sea water penetrates into deep cracks and corrodes the internal reinforcement. But there is no uniform standard for cracks’control yet because of the complexity of construction conditions and the natural environment. Based on the construction experience, we analyze all causes of cracks in wharf breast wall, and put forward relative countermeasures. Good effects have been acquired in practice.