本文对Ｐａｌｏｈｅｉｍｏ－Ｈａｎｎｕｓ １９７２年建议的结构可靠度分析的一次二阶矩法， 提出了一个便于实用的改进方法．可计算安全指标β，也可在已知目标安全指标时，无 需迭代而宜接求解含有非正态变量的线性极限状态方程中的抗力平均值ｍＲ或特征 值ＲＫ，计算表明，建议的改进方法，与国际结构安全度联合委员会（ＪＣＳＳ）所采 用的需要反复迭代求解的Ｒａｃｋｗｉｔｚ－Ｆｉｅｓｓｌｅｒ方法（也称 ＪＣ法）相比，可大大减 少计算工作量。 This paper presents a convenient and practical improvement method for the second order moment method of structural reliability analysis proposed by Paloheimo-Hannus in 1972. The safety index β can be calculated. When the target safety index is known, the resistance average value mR or eigenvalue RK in the linear limit state equation with non-normal variables should be solved without iteration. Calculation shows that the proposed improvement method Compared with the Rackwitz-Fiessler method (also called the JC method) that is adopted by the Joint International Structural Safety Committee (JCSS) that requires iterative iterative solution, the computational workload can be greatly reduced.