The Great Gatsby is a world famous novel and brings its author F. Scott Fitzgerald a huge and lasting fame. As a masterpiece, it has been studied worldwide ever since it was published. The already existed studies are mainly concerned about its background, to wit the rolling 20s,its writing characteristics especially its narrative angle and its impressionism and its metaphors of the valley of ashes and the color words. This paper researches on the three technological products namely the telephone, the car and the gun. First it introduces the lost generation. Secondly, it analyzes the circumstances these three objects are respectively involved, concluding that their implications are all negative. Last through associating their implications with the background, it induces the author's confusion.