Carry on the simple introduction to the FOB terminology and the marine insurance,introduced emphatically the insurance interest principle,and unifies the case showing insurance interest and the cargo risk shift,the cargo property rights shift relations,then proposed that the round turns are specially under seller's the question which must pay attention in FOB contract insurance.Introduces in the insurance contract “the warehouse to the warehouse” the provision,explains in the FOB contract “the warehouse to the warehouse” the provision difference Carry on the simple introduction to the FOB terminology and the marine insurance,introduced emphatically the insurance interest principle,and unifies the case showing insurance interest and the cargo risk shift,the cargo property rights shift relations,then proposed that the round turns are specially under seller's the question which must pay attention in FOB contract insurance.Introduces in the insurance contract “the warehouse to the warehouse” the provision,explains in the FOB contract “the warehouse to the warehouse” the provision difference