Diplomacy can be used in a broad and a narrow sense. City diplomacy belongs to the diplomacy in a broad sense，and refers to international exchanges carried out by city. The city diplomacy of Guangzhou is in the lead of China，especially reflected in the UCLG’s work and the establishment of Guangzhou Award. The main duty of city diplomacy refers to work under the nation diplomacy，to take part in the global governance and to serve the local economic and social development. At present，Guangzhou is trying to extend the breadth and depth of city diplomacy，speeding up the city international process，and boosting the new urbanization development.