The statistics of loading overflow construction quantities can include the sand settling in the channel range，while the sand settling outside the channel range cannot be determined.Therefore，the dredging quantities calculated according to the channel volume are much smaller than the actual dredging quantities when the engineering is checked and accepted.Based on the 100，000-ton channel project of Rongxing port area of Panjin Port，we build the tidal current and sand model of the project area by MIKE 3 hydrodynamic numerical simulation software，and calculate the overflow sand loss outside the channel range.The results show that this method can calculate the loss of loading overflow construction in the whole construction period，and it is important for the construction party to count the actual dredging quantities.