Under the background of double carbon, how to carry out the innovative practice of graduation design topic selection for the training of operational engineers is of great significance for improving the training quality of professionals in building environment and energy application engineering. This paper takes the topic of "Design of Intelligent Operation scheme of existing cold and hot supply system in Campus in Dual-carbon Era" selected by HaiRun Education Award as an example, interprets the Keywords of the topic, analyzes the graduation requirements of the general standards for engineering education certification and the knowledge and skills requirements of the professional guide for building environment and energy application engineering, and analyzes the ability composition of operation engineers. Combined with the teaching content and teaching difficulties of graduation project, the paper puts forward the path of teaching reform. This paper is based on the training of operational engineers to carry out innovative practice of graduation project topic selection, which is a positive exploration of professional adaptation to social development and engineering talent training requirements. The demonstration of this topic can provide reference for the diversified teaching reform of graduation project topic selection.