Through the study of the course "Introduction to the Basic Principles of Marxism", I feel that learning and mastering the basic principles of Marxism is the objective need of our college students' growth and long-term development, which has important practical significance. From it, I learned a lot of scientific world outlook and methodology, broadened my horizons and deepened my ideological understanding. Under the guidance of teachers, we should correctly apply the introduction to the basic principles of Marxism to deal with problems in life practice. When I look at various phenomena and problems, I learn to think rationally and see the essence through phenomena, so as to understand the objective and true side of things. At the same time, I also realize the importance of applying the basic principles of Marxism to solve practical problems. The teaching of Marxist theory is centered on practical problems. Taking practical problems as the center and integrating theory with practice is a basic principle of studying Marxism. Only with practical problems can we grasp the essence of Marxism, constantly innovate and develop Marxism, and improve ideological and political quality and innovative thinking ability through thinking about practical problems. Therefore, applying the basic principles of Marxism to solve practical problems is the basic requirement of Marxism. Only by focusing on practical problems can we deeply understand Marxism. Marxism came into being in the process of criticizing capitalism and studying practical problems in capitalist society. Fundamentally speaking, Marxism is a science. Based on practice, it profoundly grasps the laws of the development of human society and the movement of capitalist mode of production, thus revealing the inevitability and objective basis of socialism replacing capitalism. Therefore, when we study Marxism, we can deeply understand it only by closely combining the development of the times, practice and science and focusing on practical problems. Marxism is constantly developing in practice. Marxist philosophy is the essence of the spirit of the times and a science that is constantly developing in practice. Marxism has great vitality because it reflects the spirit of the times. The so-called spirit of the times is also a summary of the essence, theme and basic characteristics of a certain era. Each era has its own theme, tasks and spiritual needs, which permeate the economy, politics, culture, science and other aspects of this era. The fundamental reason why Marxism can guide the proletarian era and promote the progress of civilization lies in that it consciously takes root in the fertile soil of social practice, constantly draws its own fountain of life from real life, tests, enriches and develops itself with the transformation of the theme of the times, and scientifically answers the fundamental and important questions raised by the times at different stages. Marxism has the character of keeping pace with the times and is a science that develops with the development of practice. Practical viewpoint is the basic viewpoint of Marxism, and practicality is the essential feature of Marxism. It is an important theoretical quality of Marxism to persist in proceeding from reality, seeking truth from facts, integrating theory with practice, testing and developing truth in practice. Applying the basic principles of Marxism to solve practical problems requires us to treat the work in progress and development correctly, implement Marxism in the overall situation of Socialism with Chinese characteristics's cause, and promote the realization of the goal of building a harmonious society. 1. Developing Socialism with Chinese characteristics and Socialism with Chinese characteristics is our direction, which embodies the essential requirements of socialism and the application of Marxist principles in China. If we want to continue to promote theoretical innovation on the basis of practice and constantly open up a new realm of Marxism in China in the new great practice of developing Socialism with Chinese characteristics, we must keep pace with the times based on China's national conditions and constantly endow contemporary China Marxism with distinctive practical characteristics, national characteristics and characteristics of the times. First, adhere to the view that practice comes first, be good at summing up the most vivid practical experience in theory, and be good at guiding new practice with innovative theories, and constantly endow contemporary China Marxism with distinctive practical characteristics. Marxism is a science of practice, and practical viewpoint is the primary basic viewpoint of Marxism. Since the birth of Marxism, its deepest source of vitality and motivation only exist in practice. The construction and development of Socialism with Chinese characteristics is the only way for the Chinese nation to achieve prosperity and rejuvenation, and it is also the practical source for us to continuously promote the sinicization of Marxism in China. Various advanced models and successful experiences emerged in this great practice are rich in ideological nutrients. We should be good at absorbing nutrition from colorful practical activities, from fiery social life and from the creation of the masses, and be good at sublimating the fresh experience created by grassroots party organizations and the masses into theoretical achievements, and constantly enriching the connotation of scientific theories in practice. The correct theory not only comes from practice, but also accepts the test of practice and develops with the development of practice. We should not only proceed from the needs of practical development, accurately grasp and apply the scientific principles and spirit of Marxism, but also combine new practice to promote theoretical innovation in answering and solving practical problems. We should persist in combining theoretical study and research with promoting the solution of major practical problems in society, with solving practical contradictions in the national economy and people's livelihood, and with guiding practical work, and strive to better transform theoretical achievements into principles and policies for governing the country and guiding new practice with developing Marxism. Second, adhere to the national conditions of China, draw wisdom and nutrients from the traditional culture of China, and constantly endow contemporary China Marxism with distinctive national characteristics. Marxism is a scientific grasp of the laws and trends of world historical development and has universal guiding significance. However, this theory can only play its due guiding role if it is combined with the specific reality of all ethnic groups and countries. To take root, sprout and bear fruit in China, Marxism must fully consider the actual national conditions and cultural particularities, and embody the style of China and the characteristics of China. We should proceed from reality, combine the basic principles of Marxism with China's national conditions, focus on solving the specific problems faced by China's construction and reform, and provide scientific theoretical guidance for modernization by summing up the original experience accumulated by China people in practice. We should pay attention to absorb nutrition from China's excellent cultural traditions, and combine Marxist theory with the cultural characteristics, thinking mode, value orientation and behavior mode of the Chinese nation, so as to integrate it with China culture and create the value pursuit and value follow that reflect the requirements of the times and have national characteristics. Giving contemporary China Marxism distinctive national characteristics does not mean staying out of the trend of world progress. On the contrary, we must pay close attention to the development trend of world civilization, pay attention to observing, thinking and solving problems from the dual dimensions of the world and China, and be good at absorbing the reasonable elements of scientific progress in different civilizations. Third, keep pace with the times, deeply study and answer major practical problems in reform and development, and constantly endow contemporary China Marxism with distinctive characteristics of the times. Keeping pace with the times is the theoretical quality of Marxism. Times are changing and practice is advancing. Making a scientific and accurate judgment and analysis of the changed times and practice, making theory conform to reality and guiding new practice are the missions and heavy responsibilities entrusted by the times to contemporary China Marxism. Every era has its own problems. The characteristics of the times of Marxism in contemporary China are reflected in the response to the topics of the times and the grasp of the spirit of the times, and constantly promote social progress. The world today is undergoing profound changes. China's reform and development has entered a critical period, and new situations and problems have emerged one after another. A series of new practical topics need to be studied and answered, a series of new practical experiences need to be summarized and refined, and hot and difficult issues of concern to cadres and the masses need to be solved. We must put the requirements of the times in a very prominent position, persist in emancipating our minds, seeking truth from facts, keeping pace with the times, combine the contemporary development of Marxism with the characteristics of the times, solve the problems of the times on the basis of correctly understanding and grasping the historical process of today's social development, and constantly open up a broad space for Marxism to be China. 2. Building a socialist harmonious society. A socialist harmonious society is originally a large system composed of subsystems such as economy, politics and culture. Under the guidance of Marxist system view, to build a harmonious socialist society, we must always focus on the whole and the overall situation, base ourselves on the whole and take the overall situation into consideration. Analyze specific problems and solve problems in practice. We must adhere to the all-round development of social economy, politics and culture, and the coordinated development of material civilization, political civilization and spiritual civilization, so that socialist democracy can be fully carried forward, the basic strategy of governing the country according to law can be effectively implemented, and positive factors in all aspects can be widely mobilized. The systematic view of a harmonious society is also reflected in the fact that all aspects of society are interrelated, mutually restricted and mutually conditions for survival and development. Urban-rural coordination, regional coordination and harmonious coexistence between man and nature are the basic requirements of a harmonious society. Give full play to the radiation-driven role of cities in rural areas and the support and feedback role of industry in agriculture, and strive to promote the all-round development of rural economy and society; At the same time, promote the coordinated development of the eastern and western regions with complementary advantages and benign interaction; Strive to build a resource-saving and environment-friendly society and promote the coordination of economic development with population, resources and environment. All these require that building a harmonious socialist society must be guided by Marxism, integrate theory with practice and solve practical problems. Applying the basic principles of Marxism to solve practical problems embodies the basic principles and requirements of Marxism and is a correct ideological viewpoint and methodology. With a thorough understanding of practical work by Marxism, socialist modernization will surely achieve more brilliant achievements.