Abstract: 【Objective】 The study was carried out to explore the effects of overseeding fast-growing cold-season forage grass in winter on the yield and quality of hybrid Pennisetum in the next spring in Guangdong hybrid Pennisetum grassland.【Method】 In the row of hybrid Pennisetum that is dormant after winter castration, the fast-growing cold-season forage grass Vicia villosa, V. sativa, and Lolium perenne were reseeded in the rows of hybrid pennisetum during the winter dormancy after mowing, with non-overseeding group as control, and the yield and nutritional quality of hybrid Pennisetum were determined during spring cutting in the spring of the next year. 【Result】 The results showed the yield and quality of hybrid Pennisetum was improved in the next spring after overseeding. The yield of hybrid pennisetum after the reseeding of V. villosa, V. sativa, and L. perenne in November and reseeding of Lolium perenne in December was 11.85, 8.85, 8.83 and 7.54 t/ hm2(DM), respectively, an increase of 65.5%, 23 .6%, 23.3% and 5.3% over those of the non-overseeding control group, respectively. The group with the reseeding of V. villosa has the highest crude protein content of hybrid Pennisetum.【Conclusion】The comprehensive effect of the reseeded V. villosa on the production performance of hybrid Pennisetum was the best, followed by the L. perenne and L. perenne reseeded in November. The comprehensive effect of L. perenne was poor, which was lower than that of non-overseeding treatment.