In conjunction with the statistical Live Loads data of office buildings in China, several important statistical characteristics of the variable loads are presented, and the way to determine partial safety factors by using the new analysis method for structural safety is discussed. 文中结合我国办公楼楼面活荷载的统计分析结果,介绍了可变荷载的若干重要统计特性,还探讨了用新的结构安全度分析方法来确定分项安全系数的途径。