‘Ningjiao 12’ is a F1 pepper hybrid，produced by Ningxia Academy of Agriculture and Forestry Sciences with ‘9861’ as female parent and ‘9818’ as male parent.The growth period under open field conditions is 190-195 days，while under protected land conditions is 210-250 days.The plant is upright，with the first female flower node located at 7-8 nodes.The fruit is 26.7 cm in length，3.8 cm in width，and its flesh is 0.22 cm in thickness，78 g in average weight.The maximum single fruit weight is 90 g.The wrinkles on the surface of the fruit are large and shallow，concentrated in the upper part of the fruit.The fruit is straight，the green ripe fruit is dark green，and the old ripe fruit is bright red.The number of fruits per plant is 28-32.The fruit has good commercial properties，a spicy and fragrant taste，a vitamin C content of 0.179 g·kg-1，a dry matter content of 13%，and a total capsaicin content of 0.179 g·kg-1.Moderate resistance to epidemics and powdery mildew.The yield of 667 m2 ranges from 3 700 to 4 500 kg.It is suitable for planting in open and protected areas in Ningxia and areas with similar environmental conditions.