The flexible political symbols conveyed by“first lady”in diplomatic occasions such as women，fashion and culture，have become an indispensable part in spreading the national image.From the perspective of semiotics，this paper takes the image representation of“first lady”Peng LiYuan as a sample to analyze the communication symbols and images of the first lady.The study found that：（1）The image symbols of“first lady”are divided into three types：costume，expression and other dominant symbols to convey meanings，the present recessive symbols to refer to groups by individuals，and the rising symbols to represent culture and political rhetoric.（2）The“first lady”has formed double discourse space and presented different features in symbol transmission and interaction.（3）The flexible communication symbol of“first lady”has a unique advantage for the whole national image construction.（4）The communication of“first lady”image symbols in the Internet environment can be strengthened from three aspects.Firstly，emphasizing the diversity of communication subjects and setting the network agenda.Secondly，designing personalized communication content and using new media for integrated communication.Thirdly，dividing the audience group and adopting differentiated communication strategies.