The Old Man snd the Sea,the best works of Hemingway’s＂iceberg writing principle＂,contains a variety of connotations.Reading it from the ecocritical point of view,the dualistic nature concept of Hemingway is discovered.On the one hand,he calls for the mental triumph of man over nature from the anthropocentric standpoint.On the other hand,he affirms that nature is unconquerable and should be cherished and denounces men’s ferocious dealing with nature.The paradox of Hemingway’s ecological thought is actually a reflection of the confusion of modern people when dealing with the relationship between man and nature.