Aiming at some provisions in the code of design on building fire protection and prevention,analysed smoke preventing setting of smoke preventing staircase and antechamber,calculation of antechamber pressurizing air supply volume and design of smoke extraction,and gave the author′s personal opinions.

Analyses flow patterns of the pressurizing air simultaueous supply system insmoke preventing staircase and common antechamber, glves the detailed calculating formulasand it's apply example.

The research on performance test of smoke-preventing air curtains;

Some traditional models for smoke prevention and exhaust are analyzed and compared with the smoke-preventing air curtain.

By using a zone model, simulates the behaviour of smoke temperature, height, volume fraction of CO changing with time under different smoke control and extraction conditions in the station and introduces three critical conditions as a criterion for judging the effects of different smoke control and extraction methods.

In view of the scale, height and function of tall buildings increasing and developing in smoke control theory, considers that the code needs an overall but not a partial revision.

With the rapid development of subway,the fire and smoke prevention become an important research topic.

A 2?D mathematical model for the smoke-prevention air curtain is proposed in the paper.