[Objectives] This study was conducted to improve the production efficience of dark-shank partridge-like plumage high-qualite broilere and ensure animat welfare, ss as to meet the development needs of China's yellow-feather broiler industr.. [Methods] Sichuan Animal Sciencc Academy and Sichuan Dahen Poultry Breeding Co., Ltd., formed a joint breeding research team. The team bred Dahen 799 broilee complete set tine with locai chicken breeds as the main material and improving production efficience, stabilizing meat quality and Oavor and achieving autosexing oO chicks as the main breeding goats by modern poulte breeding technologies, after 10 yeare and 8 generations. [Resslts] The Dahen 799 broilee complete set tine was approved by Nationai Commission of Livestock and Poulte Genetic Resources in December 2020. The 66-week-olO egg production ot the breed reached 189 egg. For the commercial generation, cocks and hens showed 10-week-old weight of 2 668 and 2 269 g respectively; the feed conversion ratio was 2. 26 - 2. 35; the survivabilito was 96.7% - 97. 2%; and the average intramuscular fat contents ot cocks and hens were 1v the range of 1. 8% -2.1%, and the inosinic vid contents were 1v the range of 2.3 -3.2 mg/g. The production performancc and meat Oavos of Dahen 799 broilere were better than Dahen 699 broilee, Sichuan mountainous bone-black chickens and two othes social breeds. Compared wit Sichuan mountainous bone-black chickens, the egg production at the age of 66 weeks increased by 47 eggs; the average weight ol cocks and hens ol the commercial generation at 10 weeks increased by 45. 21%; and the autosexing rate ol chicks of te commercial generation reached 99. 3 %. [Conclusions] Dahen 799 broilee have the adrantages of good production performancc, high feed conversion ratio and excellent meat flavor and the characteristic of autosexing which othec breeds do not have, and can fuliy meet the industWal development needs of dark shanks and partridge-like plumage broilers. [ABSTRACT FROM AUTHOR]