2、nheisatthesea,aswellasthestruggleswiththebigfishandsharksindetail,thispaperwillrevealthechangeofSantiago’sattitudetowardsthebigfishandnature,vividlyshowinghumanbeingbeforethegreatnature. 【Keywords】sustainabledevelopment;coexist;harmony;oldman;sea 1.Introduction The