Bored piles are widely used in harbor construction due to their high bearing capacity,low dependence on large piling vessels and low impact on land reclamation structures.When the soft soil is deep in the project area and the construction experience is not enough,the quality problem of the cast-in-place piles is very easy to occur,and then the structural safety is questioned,which affects the acceptance of the project and the commissioning of the use of the project.In this paper,the causes and treatment methods of common problems of cast-in-place piles in wharf are summarized,and combined with engineering examples,the defects at the end of super-long cast-in-place piles with deep soft foundation are repaired by using post-grouting technology,and test data show that the reinforcing effect is good,which ensures the economy and timeliness of the project.