The evaluation of prefabricated buildings is a standardized certification work based on national and local standards, and is a crucial technical link in the entire process of consulting projects. Taking a high-rise prefabricated residential project in Hangzhou as an example, this paper introduces the implementation paths of concrete structure and steel structure prefabricated buildings. Key technologies such as laminated floor slabs, high-precision templates, retaining walls, ALC slats, and prefabricated steel structure systems were discussed. In prefabricated steel structure systems, the steel truss composite floor system is an effective means to achieve A-level or even higher rating recognition.