Steel structure has the advantages of high strength, strong load-bearing capacity, good seismic performance, small volume of self occupied space and convenient manufacturing and installation of steel members. Concrete filled steel tube structure can adapt to the development of modern engineering structure to large-span, high-rise, heavy load and bear harsh conditions, which meets the industrialization requirements of modern construction technology.However, the fire prevention problem of steel structure itself is one of its major weaknesses. It is non combustible, high temperature resistant but not fire-resistant. The fire resistance limit of steel members without protection is generally 0.25h. The poor fire resistance performance of steel itself should be the fatal defect of steel structure building.Therefore, the fire protection technical measures of steel structure should be paid attention to.At present, the main fire protection measures of steel plate and gypsum board in China are fire-proof material and fireproof gypsum board.In the fire resistance design of steel structure members, fire protection technical measures are usually adopted to improve the fire resistance performance of steel members, and then the standard fire resistance test is used to verify the fire resistance limit value of steel members, so that the steel members can meet the specified fire resistance requirements. At present, the commonly used fire protection technical measures to improve the fire resistance performance of steel members in China are as follows:

 1、 Fire retardant coating method, fire retardant coating engineering adaptability, light weight, low thermal conductivity, suitable for any shape, any part of the components, fire retardant coating cost is low, easy to operate, fast construction, not limited by the geometry of steel components, has good economy and practicality, but the surface of components is not smooth, affecting the beauty. 　　

 2、 In the method of fireproof board, fireproof materials or fire bricks are placed on the periphery of the components to isolate the components from the flame, which can greatly improve the fire resistance time of the structure.According to the different density, the fireproof board can be divided into low-density fireproof board, medium density fireproof board and high-density fireproof board. According to the different thickness, it can be divided into fireproof thin plate and thick fireproof board.The fire-proof board does not burst and crack when exposed to fire. It has low shrinkage rate under high temperature. The construction conditions and walls are effectively connected to avoid cracks and pulverization. The appearance is smooth and smooth without environmental pollution. 

  3、 In addition, fire protection methods include fire-proof steel bar, cement mortar and fire-resistant light-weight plate as fire-proof outer layer.For example, steel members are covered with fiber reinforced cement board, gypsum board, calcium silicate board and vermiculite board.The fire protection method and material selection of this kind of steel members still need to be further studied. 

In China, fire retardant coating and fireproof board are widely used fire prevention measures. Compared with fire retardant coating, fireproof board has good sound absorption and sound insulation effect, saves space and has certain decoration. After the construction is completed, there is no need to do special maintenance, which is more in line with the requirements of modern construction. Under the premise of vigorously promoting prefabricated housing, the fireproof board has stronger Application advantage is the development direction of steel structure fire protection technology in the future.