This study focuses on the measurement of possible affecting factors on fire risks by investigating both from real cases and official reports of building fires during January 2000 to February 2002 in Taiwan including Taipei city, Taipei county, Taoyuan county, Hsinchu county, Taichung county, Tainan county, Tainan city and Kaohsiung city. Based on the time sequence of fire occurrence and effect possible, influencing factors will be measured through questionnaires. Contexts of investigations include occupant and user characteristics, building occupancy characteristics, fire protection systems, fire development and spread, fire service of fire brigade and the resulting property losses. Using statistical methods such as factor analysis, difference test and Chi-square analysis important factors are conceptualized and conducted.