Abstract: With the economic development and the advancement of energy reform in China，the composition of centralized heating source，heating network scale and heat consumption at user's end encounter a major change.Employment of clean sources and consumption of renewable heating sources are the major trends and challenges to the existing operation control method taken by traditional heat-supply systems. A smart heat-supply technology path was proposed based on digital twin and engineering concept to promote the development of intelligent heat-supply system. Compared with the conventional roadmap，the center of the smart heat-supply system is a framework made up of a physical device layer，a sensing and control layer，a transport layer，and an intelligent decision-making layer. The physical device layer including heating sources，network，load and storage equipment，provides physical basis required by smart heating. The sensing and control layer realizes the comprehensive perception on the entire system，providing data required by the intelligent decision-making layer and carrying out the decision sent downwards. The transport layer connects the physical equipment uploading real-time data and the decision-making layer giving orders. The intelligent decision-making layer can realize fault detection and diagnosis，data-based prediction，optimized dispatching and energy efficiency analysis，based on the digital twin model of the system. A case study made on a smart heating site shows that this roadmap could reduce the energy consumption in the entire system with such a framework.

Key words: smart heating, technology roadmap, digital twin, clean energy, renewable energy, source-network-load-storage