In view of the crack problem after casting of breast wall in Abidjan Port expansion project,statistical analysis and intense research have been made,which show that the cracks always appear in the middle of the structure.The countermeasure of crack is explored by the internal temperature monitoring and shrinkage stress analysis of breast wall.It is found that the lower the temperature difference caused by hydration heat and concrete shrinkage is,the less cracks will appear.A series of experiments are carried out in the site and the ideal countermeasure of crack is found out,which is using the low hydration heat slag cement and better maintenance of poured concrete,and the cracks are effectively controlled by adopting these measures.This paper gives the developing regularity of temperature shrinkage cracks in the breast wall,and the ideal crack controlling method is found out.