The only pure animal husbandry county in Hongyuan-Aba Prefecture, where Tibetans live mainly, played a very important role in the Red Army's support of the Red Army to transport supplies and wounded and sick across the grassland and marsh. Comrade Mao Zedong highly praised the great innovation of the "Yak Revolution" unique to the history of Chinese revolution in the Red Army's journey to climb the snowy mountains and cross the grass.