The article discusses how industrialization, informationization, urbanization, and agricultural modernization are important for modernizing China. Industrialization helps develop informationization, urbanization, and agricultural modernization. Informationization is crucial for industrialization, urbanization, and agricultural modernization. Urbanization relies on informationization and industrialization, and drives agricultural modernization. Agricultural modernization depends on informationization, supports industrialization, and speeds up urbanization. Synchronized development of these four aspects is necessary for modernization, integrating city and countryside, advancing modernization, and achieving a harmonious society and common prosperity.