The projects of engineering doors and windows are mainly divided into public construction projects and residential projects. The trend of public construction projects is refinement and integration of doors, windows, and curtain walls, while the trend of residential projects is centralized procurement, fine decoration, factory modularization, and regional characteristics generalization. Therefore, traditional engineering door and window enterprises must follow the trend and make necessary adjustments to the focus of product structure management, sales channels, and cooperation models. The specific operational measures for all of these are first based on the prediction of the market trend of engineering doors and windows and the change of concepts. Haier's corporate philosophy is to "keep the concept unchanged and change it, and broaden the world as the concept changes." For engineering door and window enterprises that are currently at a historic transformation node, perhaps Haier's statement is the most valuable reference. Conceptual transformation is necessary, and how to transform and implement it is the key point. Below is a specific analysis of public construction projects and residential projects.

Public construction projects: Public construction projects are increasingly embodying the characteristics of shaping, and the ratio of curtain walls to doors and windows is tilting towards the curtain wall. Therefore, door and window engineering enterprises either extend the curtain wall panels or closely cooperate with curtain wall enterprises. The traditional state of pure doors and windows in public buildings will become less and less, and the large volume, long construction cycle, and long capital redemption cycle of public buildings are not ideal choices for small and medium-sized door and window enterprises. Moreover, with the decreasing number of public building projects, the trend of curtain wall enterprises extending their door and window business and general contracting enterprises extending their curtain wall door and window business is becoming more and more obvious. Therefore, in the long run, Public construction projects are not the main battlefield for simple door and window enterprises.

Residential projects: Residential projects are the main battlefield for door and window enterprises, but the trend of building prefabricated factories has gradually emerged. How to achieve supporting product design and installation processes is a direction worth considering and laying out in advance for door and window enterprises. In this regard, Japan has certain pioneering experience that can be used for reference and reference,

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