Abstract:From the perspective of building the urban life support system, the importance of grey and green infrastructure as well as grey-green collaboration is re-cognized. The research progress of grey-green collaboration in the three hot directions of water-related infrastructure, transportation infrastructure and energy infrastructure by systematically sorting out the relevant domestic studies, and then the concept, connotation, characteristics and theoretical framework of grey-green collaboration are proposed, which will provide the theoretical support and practical basis for the subsequent refinement of the collaborative technology system. In addition, the limitations of the grey-green collaborative theory in the past research are discussed. And four-point prospects are proposed for the collaborative direction, collaborative technology, collaborative evaluation and collaborative digitalisation, which provide the corresponding suggestions for strengthening the infrastructure collaboration and solidly promoting the construction of ecological civilization.