City Fire Risk Analysis based on Coupling Fault Tree Method and Triangle Fuzzy Theory

City fire risk analysis is a very important basis for scientifically and effectively planning and deploying urban fire protection and formulating its related regulations. It also can guarantee and facilitate the coordinated development of city's economic construction and social economy. Combining the city's development characteristic of China and the fire control safety management state, the thesis based on fire control safety engineering and systematic safety engineering theory and combine, has set up the fire risk fault tree of city area. Applying the method of the fuzzy important degree sorted the basic incident of the fault tree and did a fuzzy graduation on the factors of caused fire. The order and grade of fuzzy probability has shown that the main factors of limiting fire risk are the city area overall arrangement, the moved fire control strength and the personnel quality, which is in conformity with the main reason of the city fire of our country taken place over the years. For this reason, in order to limit the city fire risk fundamentally, we must manage the above three important factors strictly, which has a very positive significance for city fire safety management of China.