There has been little information on reproductive biology of the genus Seicercus. From April to August 2015, observations on breeding ecology of Chestnut-crowned Warbler (Seicercus castaniceps) were made in Kuankuoshui National Nature Reserve, Guizhou, Southwestern China. The results based on camera monitoring of four nests showed that Chestnut-crowned Warbler started their reproduction from May to July, and all nests found were ball shaped with dome and made of fresh moss and fine roots, which were built on the inner side of soil ridge along the road. The clutch size of Chestnut-crowned Warbler was 4.50±0.57 , with incubation period being 12~13 days, and nestling period 13~14 days. Both the female and the male fed nestlings. Nesting success was up to 100% and hatching success was 88.9% (16 out of 18 eggs), with fledging success being 3.25 neslings per nest.