Based on previous studies on soil polarization of mono-species coniferous forests, an incubation-for-decomposition experiment was conducted of mixtures of soil samples collected from humus layers of Platycladus orientalis, Pinus tabulaeformis and Larix principis-rupprechtii forests in the semi-humid loess hilly region of Shaanxi with litters of seven species of forage grass to explore effects of forage litters remedying pure coniferous forest soils and hence to accumulate scientific data for selection of suitable soil-remedying species of forage grass. Results show that in the pure P. orientalis forest soil, all the litters displayed significant effects mitigating the negative polarization of readily available K, and the litters of Medicago sativa, Leapedeza bicolor, Astragalus adsurgens, Vicia villosa and Melilotus officinalis had similar effects on the activity of protease; in the pure P. tabulaeformis forest soil, all the litters had such similar effects on alkalytic N, those of V. villosa, M. sativa and Melilotus officinalis had on available P, and only the litter of M. sativa had on the activity of sucrase; and in the pure L. principis-rupprechtii forest soil, the litters of L. bicolor and Onobrychis viciaefolia had such similar effects on alkalytic N, the litters of M. sativa, O. viciaefolia, Coronilla varia and V. villosa had on available P, all the litters except those of M. sativa and V. villosa had on organic matter content, and all the litters except that of M. sativa had on the activity of phosphatase. Integrated PCA (principal component analysis) shows that in the pure P. orientalis forest, the litters of A. adsurgens, C. varia, L. bicolor and V. villosa had better comprehansive remediation effects on the soil, in the pure Pinus tabulaeformis forest, the litters of M. sativa, C. varia and M. officinalis had, and in the pure L. principis-rupprechtii forest, the litters of M. sativa, M. officinalis and O. viciaefoli had.