Mainly include: (1) Fuel surcharge: added when the fuel price suddenly rises. (2) Currency depreciation surcharge: when the currency is depreciated, the ship owner will charge a certain percentage of the basic freight rate for the actual income not to decrease. Additional fee. (3) Transshipment surcharge: All goods transported to a non-basic port need to be transshipped to the destination port. The surcharge charged by the ship includes transhipment fee and two-way freight. (4) Direct voyage surcharge: When the cargo is transported to a non-basic port reaches a certain volume, the shipping company can arrange direct voyage to the port without transshipment.