从1949年中华人民共和国成立到1978年党的十一届三中全会召开前,新中国走过波澜壮阔而又曲折复杂的29年历程。全面认识、准确把握、正确评价这段历史,意义重大。中共中央党史研究室原副主任张启华在《在探索中前进的中国共产党》一文中提出,探索是这29年历史的主题和主线,在探索中取得巨大成就是这29年历史的主流和本质,同时也要正确认识探索中发生失误的原因,正确认识这29年的探索和改革开放的关系。 From the founding of the People’s Republic of China in 1949 to the Third Plenary Session of the Eleventh Central Committee in 1978, New China has gone through a magnificent and tortuous journey of 29 years. It is of great significance to comprehensively understand and accurately grasp this correct history. Zhang Qihua, former deputy director of the CPC Central Party History Research Institute, proposed in his article “The Communist Party of China Moving Forward in Exploring.” Exploring is the theme and main line of the 29-year history. Achieving great achievements in the exploration is the mainstream and essence of the 29-year history. At the same time, we must also correctly understand the reasons for the mistakes in the exploration, and correctly understand the relationship between these 29 years of exploration and the reform and opening up.