To further study the wave field at Hailong bay,we establish the whole mathematical model to analyze the wave field inside and outside the port.Using the extended parabolic mild-slope equation,we finish the sea-to-port entrance wave deduction and simulate the wave transmission from the offshore to the near-shore.By the elliptic mild-slope equation,we simulate the wave distribution within the port area.The result shows that the recommended breakwater can well shelter the main wave and the recommended scheme is reasonable and feasible.Compared with scheme comparison,wave conditions of recommended design scheme is much better.And the contour map indicates that recommended design scheme is feasible.Overall,the whole mathematical model of wave field at Hailong bay is effective,and it can provide a scientific reference for the engineering practice.