Since the 18th CPC National Congress, the Communist Party of China has united and led the Chinese people to make historic achievements in reform, opening up and socialist modernization, and socialism with Chinese characteristics has entered a new era. The Eighth National Congress of the Communist Party of Cuba made strategic planning and deployment for the cause development of the Cuban party and state at present and in the future, and drew a blueprint for Cuba to build a prosperous, democratic and sustainable socialism. Facing the new situation and new tasks, the theoretical discussion between the two parties in China and Cuba on the theme of "strengthening Party building and striving for a new journey of socialism in the new era" coincides with the time, which is of great significance for us to explore the socialist development path in line with our national conditions. The fourth Sino Cuban bipartisan Theoretical Seminar was co sponsored by the external liaison department of the CPC Central Committee and the International Relations Department of the CPC Central Committee and held by video from March 23 to 24. (Xinhua News Agency)