With the global awareness of energy conservation, emission reduction and environmental protection, green building has become the development trend of the future construction industry. As an integrated design management tool, BIM(building information modeling) technology provides strong technical support for green building design. Based on this background, the application capability of BIM technology in the field of green building design and its impact on improving the sustainability of green building design were explored.The BIM application ability evaluation index system was established, then entropy weight method was adopted to assign weight, and fuzzy comprehensive evaluation method was used to evaluate the BIM application ability of a green building design team. Specific suggestions are put forward.