Abstract:Construction of modern economic system is important and urgent task for high-quality economic development in China. Focusing on strengthening strategical support to construction of modern economic system by sci-tech innovation, this study analyzes from three perspectives, namely, promoting deep integrated development of sci-tech and economy, self innovation track, and fastening the construction of innovative country and world science and technology power. Strategical routes and key tasks are put forward, designating to provide driving force of innovation, core pillars, and solid sci-tech foundation for construction of modern economic system.