Abstract: In the face of the major changes of social principal contradictions in the new era and the complex changes taking place in domestic and foreign environment, in order to promote a more sustainable and healthy development of the socialist economy with Chinese characteristics, Xi Jinping has pushed forward theoretical innovations, formed the Xi Jinping’s economic thought on socialism with Chinese characteristics for the new era, and realized the major theoretical innovation for Marxist political economy. This major theoretical innovation includes the distinctive development theme of high-quality development, the scientific guiding ideology of new development philosophy, and the strategic choice of new development pattern. As important concepts to understand Xi Jinping’s economic thought on socialism with Chinese characteristics for the new era, the high-quality development, the new development philosophy and the new development pattern constitute the policy basis for promoting China’s economic development at the new stage and in the new era. These three theoretical innovations, i.e., with the new development philosophy as the value guide, smoothing the domestic and international dual circulation, and helping the high-quality economic development, constitute an organic integrity, which has enriched the Marxist concept of development and promoted the innovative development of Marxist political economy in the 21st century.

Key words: high-quality development, new development philosophy, new development pattern, Marxist political economy