The fundamental reason for all our achievements and progress since the new period can be summarized as follows: Socialism with Chinese characteristics Road was opened up and the socialist theoretical system was formed. In a word, we hold high the great banner of Socialism with Chinese characteristics. The issue of flags is of paramount importance. Socialism with Chinese characteristics is the correct choice and great creation of the Communist Party of China (CPC) people in the new historical period of reform and opening up, and it is also constantly enriched and developed in the new historical period of reform and opening up. China is a big developing country and has accumulated valuable experience in getting rid of poverty, speeding up modernization and consolidating and developing socialism. The 17th National Congress of the Communist Party of China summarized it as "ten combinations". Practice has proved and will continue to prove that only by holding high the banner of Socialism with Chinese characteristics can we develop China and socialism and realize the great rejuvenation of the Chinese nation. Holding high the banner of Socialism with Chinese characteristics is a historical choice, a choice of the times and a choice of the people. The road problem is the primary problem related to the success or failure of the party's cause. The 17th National Congress of the Communist Party of China has clearly defined the road to Socialism with Chinese characteristics, which is: "Under the leadership of the Communist Party of, based on the basic national conditions, centering on economic construction, adhering to the four cardinal principles, persisting in reform and opening up, liberating and developing social productive forces, consolidating and improving the socialist system, building a socialist market economy, socialist democratic politics, advanced socialist culture and a harmonious socialist society, and building a prosperous, strong, democratic, civilized and harmonious socialist modern country. The reason why this road is completely correct and can lead the development and progress of China lies in adhering to the basic principles of scientific socialism and endowing China with distinctive China characteristics according to its reality and characteristics of the times. Ideological and theoretical construction is the fundamental construction of the party, and the theoretical innovation of the party leads all aspects of innovation. The 17th National Congress of the Communist Party of China summed up the theoretical achievements of China Marxism in the past 30 years of reform and opening up, and pointed out: "Socialism with Chinese characteristics theory system is a scientific theory system including Deng Xiaoping Theory, Theory of Three Represents and Scientific Outlook on Development". Socialism with Chinese characteristics's theoretical system is the latest achievement of Marxism in China, and it is the inheritance and development of Marxism-Leninism and Mao Zedong Thought. In contemporary China, to adhere to Marxism, we must adhere to Socialism with Chinese characteristics's theoretical system; Adhering to Socialism with Chinese characteristics's theoretical system means truly adhering to Marxism. With the deepening of Socialism with Chinese characteristics's practice, this theory will be enriched and developed.