Abstract: ‘Youmei 518’ is a new variety of large fruit type cowhorn pepper with stable and consistent traits, which was bred by crossbreeding the stable cowhorn pepper inbred line ND16-3 as the female parent and the large fruit type coarse cowhorn pepper TS8 introduced from Japan as the male parent.This variety of peppercorns has robust growth, with a height of 65 cm and a width of 60 cm.The first flower has an average of 12-13 nodes.The fruit is briht green and it is an early-maturing and large fruiting type of peppercorns, with a vertical diameter of 26 cm and a horizontal diameter of 6.45 cm.The flesh is 0.38 cm thick and each fruit contains 3 locules.The plants have strong fruit setting ability, with an average single fruit weight of 125 g and an average yield of 3125.45 kg per 667 m~2,which is an average increase of 10.75% compared to the control.The vitamin C content in the fruit is 806.0 mg·kg^-1,and the capsaicin content is 8.5 mg·kg^-1.‘Youmei 518’ is resistant to anthrax and epidemics, and moderately resistant to longevity diseases.It is suitable for planting in early spring in various provinces such as Henan, Jiangsu, Shanxi, Shaanxi, Shandong, Anhui, Liaoning, Hubei, Hebei, and Xinjiang.In May 2019,it was registered as a non major crop by the Ministry of Agriculture and Rural Affairs, with the registration number is GDP pepper（2019410150）.