At the invitation of Chinese court, Siamese king dispatched at regular intervals tribute missions to China, with formal tribute for presentation to the Chinese courts and ballast cargo for sale at Canton or Peking.

• 受清廷的招徕，暹罗国王定期派遣使团携带贡品来华朝贡，并可于贡船上附带压舱货物在广东或北京销售。