49.4773 million mu. There are 3,533,300 hectares (52,567,800 mu) of natural grassland in Hainan Prefecture of Qinghai Province, of which 49,477,300 mu can be used, accounting for 94 1% of the total grassland area, and the average livestock occupation is 13438+0 mu. The grassland area in winter and spring is 27 142700 mu, accounting for 54.86% of the available grassland area.