The thesis makes it clear that a maritime lien on vessel shall have priority over possessory lien on vessel and possessory lien on vessel shall have priority over a ship mortgage.

• 通过分析船舶留置权与船舶占有的关系，指出了船舶占有的定义、分类、丧失和恢复；明确了船舶留置权与其他担保物权的受偿序位关系；