When Tianjinghao is dredging at sea,the wave parameters should satisfy certain conditions to ensure the safety of construction.In order to make sure whether the wave conditions sheltered by the breakwater meet the construction requirements of Tianjinghao,numerical model is used to calculate wave parameters in breakwater shelter with different progress node of a container terminal project,analyze adaptability of Tianjinghao,and calculate breakwater length need to extend to meet the construction requirements.The results show that the wave numerical simulation technology can provide a reliable basis for safe operation of dredger at sea and avoid risks.