Considering the sediment difference during the flood tide and the ebb tide, two formula deduced from the viewpoint of energy balance, for suspended sediment carrying in the Yangshan harbor of each flood and ebb tide are established. The suspended sediment carrying is calculated from the equation that the formula evaluating the bottom sediment flux by shear stress equals the formula by suspended sediment carrying. The observed data at the Yangshan harbor in October of 2003 is taken to calibrate the coefficients of the formula for suspended sediment carrying. Finally, the formula is verified by the measured data of suspended sediment concentration in the Yangshan harbor in July of 2005. The result shows that the established formula for suspended sediment carrying in the Yangshan harbor has a high precision. The calculated sediment concentration is in agreement with the measured ones.