According to relevant data, the venue of the Third Plenary Session of the Eleventh Central Committee of the Communist Party of China is Xishan Conference Hall in Haidian District, China. Baidu map shows that the address of the Third Plenary Session of the 11th CPC Central Committee is Xishan Conference Hall, Haidian District, China. The meeting was held from 1978 12 18 to 22, which is one of the important milestones of China's reform and opening up, and marks a new era for China. At the meeting, Deng Xiaoping put forward the slogans of "emancipating the mind, seeking truth from facts" and "promoting democracy, criticism and self-criticism", and put forward the basic ideas and policy measures of reform and opening up, which laid an important foundation for China's economic and social development.