Characteristics of appearance,skull,scapula and fin bones morphology were described by 69 measurements taken from 14 specimens Sousa chinensis dead in the Pearl River Estuary. Those measurements were analyzed by one-way ANOVA to reveal the sexual dimorphism between individuals from different geographic locations. No difference was found in external measurements between male and female, but significant difference was detected in partial measurements on skull,scapula and fin bones between male and female. In general,the mean values of most measurements were larger in female than those in male.