Objectives The problems of weak links, unstable production performance, and decreased purity in the current breeding system of Hulunbuir sheep were solved to protect local resources of purebred sheep and provide purebred livestock for breeding Hulunbuir sheep hybrid. Methods Hulunbuir ewes and rams with normal growth and development, healthy and disease-free, and good body size at Hadatu Farm, Hulunbuir City, Inner Mongolia Autonomous Region were selected for mating each year from 2019 to 2024. The birth weight, litter size, litter gender of all lambs experimented, and the weight, length, height and chest circumference of all sheep at 5 and 18 months of age experimented were measured and analyzed with successive breeding. Results The growth rate of 0-5-month-old rams and ewes after breeding increased by 14.95 and 13.72 percentages, respectively. The reproduction rate and the rate of twin lambing both increased by 8.3 percentages. The growth performance of ewes at the stage of early growth was significantly increased(P<0.05). A total of 5 core groups of Hulunbuir sheep were established, giving birth to 4 574 lambs. Conclusions The technology of breeding Hulunbuir sheep purebred can increase the growth rate, reproduction rate and the rate of twin lambing, enhance the growth performance, expand the core population, and strengthen market competitiveness.