The purpose of establishing safety index system is to evaluate the quality of architectural engineering & construction throughout building lifecyle management and faciliate the safety management in construction enginerring industry.Through the comprehensive research of quality evaluation of Shanghai AEC projects, the auther created the safety index system based on three levels of data including the index, the factor, and the coefficient to define the safety level of building engineering.Based on the theory, the calculation model of safety index is built.Furthermore, the safety index system of construction engineering industry is demonstrated to be a ideal tool to define and compare the building quality quantitatively and dynamicly.By studying key data, the internal factors of safety variation can be discovered and imporved, hence the project management can be upgrated onto a controllable and quantitative level.