After a period of time, semi-unitized design was occur in curtain wall technology. In this system, the mullion members are separately installed first, then pre-assembled framing units are placed between them. These units may be full story height, or they may be divided into a spandrel unit and a vision glass unit.

Hybrid system is advantage to use when for long span of two floors, which can be reinforced by steel. This system need large amount of labour for field jointing work and the erection time is comparatively greater.

As system has high production and fabrication and assembly precision, the quality is easy to be controlled.

Fast installation, simple operation, short construction period and high efficiency of construction

The structural components can be manufactured from a variety of materials to keep the weight down, while also ensuring design flexibility

Reasonable selection and usage of materials