As a common species in Yunxian County, Yunnan, little information is available concerning the breeding biology of Black-throated Prinia (Prinia atrogularis). From March to September in 2016, we conducted field studies on the Black-throated Prinia in this region. Logistic growth curve was used to fit the nestling weight and external organ growth data. The Black-throated Prinia bred from early March to late September in our study area. During the study period a total of 42 nests were found, mainly located in the weeds (n = 37) (Fig. 1a) and shrubs (tea tree) (n = 5). The process of nest building lasted 5 to 6 days, with both females and males involved. Nest materials included lichen, withe, slender root, fine grass leaves and stems, and so on. The shape of the nest was spherical, and the openings of the nests were in the middle and upper part of lateral side, with length of 4.9 ± 0.7 cm, and width of 4.0 ± 0.5 cm (n = 25) (Fig. 1a). Nests weighted 8.3 ± 1.7 g, with length of 13.2 ± 0.9 cm, and width of 8.2 ± 0.5 cm. Female laid one egg every morning and the average clutch size was 3.9 eggs (3﹣4 eggs, n = 21), with fresh weight of 1.38 ± 0.09 g, 17.3 ± 0.7 mm × 12.6 ± 0.3 mm in size, and 1.4 ± 0.1 cm3 in volume (n = 65) (Fig. 1b). The incubation period was 13.9 ± 0.9 d (n = 5, 13﹣15 d). The nestling period was 13.5 ± 1.3 d (n = 5, 12﹣15 d). Logistic curve showed that nestling weight and culmen length grown fastest at about 5 days old, body length, wings, tarsus of nestling grown fastest at about 7 days old (Fig. 2, 3). 14 of 42 nests were too far to observe their breeding results, for the 28 nests we monitored, 7 succeeded and 21 failed. The main reasons for nest failure were predation (62%), nest desertion (14%) and human disturbance (14%).