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本文针对半经验方法存在的一个关键问题，即如何校正构成大震的各子震与小震波谱的差异，提出了解决办法．其中包括：用随机模拟某些震源模型参数的方式体现震源过程的不均匀性、地震动高频分量的随机性及模型参数选择的不确定性；考虑大震的高频饱和特性；扣除小震震源函数的中、低频特性对合成结果的影响；指出合成地面运动加速度时不用做方向性因子校正．利用这一方法得到的唐山主震（Ｍｓ＝７．８）两个场址的地面运动加速度拟合结果与观测记录对照比较表明，本文方法合理，所得结果可靠．
In this paper, a key problem existing in semi-empirical methods is how to correct the difference between the sub-earthquakes and the small earthquakes that constitute a large earthquake and put forward solutions. These include: modeling of some hypocenter model parameters to reflect inhomogeneity of source processes, randomness of high-frequency components of ground motions and uncertainty of model parameter selection; considering high-frequency saturation characteristics of large earthquakes; deducting small earthquakes The influence of middle and low frequency characteristics of the hypocenter function on the result of the synthesis is pointed out. It is pointed out that the directional factor correction should not be used when composing the ground acceleration. The comparison between the fitting results of ground motion acceleration at two sites of Tangshan mainshock (Ms = 7.8) and observation records obtained by this method shows that the method in this paper is reasonable and the results obtained are reliable.