In March 2011

a logistics center made of steel structure caught fire.With burned area of over 7

000 m2

the fire resulted in heavy losses.This paper analyzes the cause

spread of the fire and collapse of the structure and discusses the fire-proof design and fire-resistance measures for steel structure.Research results show that:（1） fire-resistance property of steel structure is bad and the steel structure is vulnerable to collapse

which leads to many difficulties in fire fighting;（2） steel structure is easy to collapse as a whole during fire

which results in heavy losses;（3） lack of fire compartmentation enhances the spread of fire and enlarges the burned area

which brings added losses and difficulties in fire fighting.As a result

we should:（1） set up fire compartmentation;（2） raise or guarantee the fire duration of steel columns and beams to enhance their fire-resistance capacity;（3） add fire cover to steel structural parts and connections;（4） guarantee the normal performance of automatic sprinkler system for effectively putting off the fire during the initial stage.