The suitable area of migratory birds in the current climate accounts for 16.43% of total area of China. In the future scenario, the percentage of the suitable area are 16.07% of total area of China in RCP2.6 and 14.69% of total area of China in RCP8.5. Compared with the current climate, the suitable area decreases by 0.36% of total area of China under RCP2.6 scenario and 1.74% of total area of China under RCP8.5 scenario. The habitat transformation in future is shown in Fig 2. Display in accordance with the calculation results, the habitat area will decrease (Rushing et al., 2016; Saino et al., 2011). The habitat change for 7 orders of migratory birds is shown in Fig.S2.